“Nor does he speak from [his own] inclination. It is not but a revelation revealed.” [Quran 53:3-4]
. In essence, this took place in three forms or ways:Through sayings, actions, as well as his physical characters and personal attributes and his approvals of others’ acts and sayings: said. ‘Umar Ibn Al-Khattaab, may Allah be pleased with him, said that the Messenger of Allah said: “Indeed, all actions are based on intentions, and surely, every man shall have only that which he intended. Therefore, whosoever immigrated for the sake of Allah and His Messenger, then his immigration is for Allah and His Messenger.” [Muslim] actions and deeds. For example, ‘Aa’ishah, may Allah be pleased with her, said: “He used to fast so much that we would say he would never break the fast, and he used to abstain from fasting for so long that we would say he will never fast.” [Bukhari] then he approves of it either by being silent and not commenting on it (Tacit Approval) or by saying something that would indicate agreement or endorsement of it (Explicit Approval). An example of the tacit approval would be the incident reported by Sa’eed Ibn Abi Awfa, may Allah be pleased with him, that he went with the Prophet, sallallaahu alayhi wa sallam, on seven expeditions, and we ate locust with him (while he was watching).” [Bukhari and Abu Daawood] An example for the explicit approval is reported by Abu Sa’eed Al-Khudri, may Allah be pleased with him, that two men were traveling without water, so at the time of the Prayer they made dry ablution (Tayammum). Then sometime later, they found water and one of them repeated ablution and Prayer but the other did not. When they told the Prophet he told the one who did not repeat: ‘what you did is the Sunnah,' and said to the other: ‘you will get a double reward.’[Abu Daawood] character like Ibn ‘Abbaas, may Allah be pleased with him, description of him as being, “The most generous of all people.” [Bukhari], as well as his physical attributes, as in the Hadeeth, “He had a face that was more beautiful than all people’s, he was best in character, and was of an average height: not too long or short.” [Bukhari] said: "Whoever avoids following my Sunnah does not belong to me.”[Bukhari] Also, Talhah Ibn Auf 
stated that once he was praying "behind Ibn ‘Abbaas, may Allah be pleased with him, in a funeral prayer, when he recited Al-Faatihah, the opening chapter of the Quran, then said: ‘I have recited this chapter for you to know that this is the Sunnah of the Messenger of Allah ."' [Bukhari]
Saheeh Al-Bukhari
Of all the works of Hadeeth, Saheeh Al-Bukhari and Saheeh Muslim are regarded as the most authentic and authoritative books, after Al-Quran. Indeed the very word "Saheeh" means "authentic". Saheeh Al-Bukhari was compiled by Imam (leader) of Hadeeth, Mohammad Ibn Isma'eel Al-Bukhari, born 194H in Bukhara, central Asia. He traveled at an early age seeking knowledge to Hijaz (Makkah and Madeenah), Ancient Syria, Iraq, Egypt etc. He devoted more than 16 years of his life to the actual compilation of this work. He learnt from more than 1000 scholars. It is said that Imam Al-Bukhari collected over 300,000 Hadeeths and he himself memorized 200,000 of which some were unreliable. He wrote many books especially on the bibliography of Hadeeth narrators and other books on various issues of Fiqh (Islamic jurisprudence). However, his book ‘Saheeh Al-Bukhari’, stands out for being the most authentic book of Hadeeth. It was also the first book to contain only authentic Hadeeths, while previous books contained authentic and non-authentic Hadeeths, as well as sayings of the companions 
and others. Imam Al-Bukhari died in his hometown, Bukhara in the territory of Khurasan (West Turkistan), in the year 256H.
He grouped the traditions of the Prophet under various headings dealing with specific points of Islamic jurisprudence. In his time, the schools of law had been generally established and his objective was to catalogue the traditions he regarded as authentic in relation to their respective topics of jurisprudence.
Before he recorded each Hadeeth, he would perform ablution and offer a two-Rak'ah prayer and supplicate to Allah. Many religious scholars of Islam tried to find fault in the great remarkable collection, but all in vain. It is for this reason, they unanimously agreed that the most authentic book after the Book of Allah is Saheeh Al-Bukhari.
Some facts about Saheeh Al-Bukhari
1. It contains 7,275 Hadeeths, which he chose from the large number of Hadeeths that he had collected.
2. The number of complete unrepeated Hadeeths is 2230.
3. All the Hadeeths mentioned are authentic.
4. The conditions for accepting a Hadeeth were very stringent. Such as:
a) The chain of narrators must be linked, i.e. every narrator must have met his predecessor, (the man of whom he heard the Hadeeth from, up to the Prophet .)
b) For it to be enclosed in the Saheeh, the narrators must be of the highest caliber regarding their piety, manners, memory, integrity, etc.
5. The book is not a mere book of narrations; it is essentially a course of study on Hadeeth, its derivatives, inductions and research.
6. Each one of its 97 chapters is headed by a relevant verse from the Quran that complements the meaning of the Hadeeths quoted.
7. Finally, much more could be said about this monumental work, however, it is enough to say that many people have reached fame and achieved the highest qualifications by studying the book, researching it and commenting on it.
Saheeh Muslim
Saheeh Muslim is the second most authentic book of Hadeeth after Saheeh Al-Bukhari, compiled by Imam Muslim ibn Al-Hajaj Al-Nisapuri . Born in 202H and died in 261 H. He traveled widely to many countries such as Iraq, Hijaz, Ancient Syria, and Egypt to gather his collection of Hadeeth. He learnt from many scholars, most of which were Al-Bukhari's teachers. He also learnt from the Imam Al-Bukhari himself and became his most loyal student. Like Imam Al-Bukhari, Allah have mercy upon him, he, Allah have mercy upon him, wrote many books on the sciences of Hadeeth.
He, Allah have mercy upon him, sought not so much to complement the issues at stake in the fiqh (the lslamic jurisprudence) but rather to produce a collection of sound traditions, an authentic record, on which future studies of Hadeeth could be based.
Some facts about Saheeh Muslim
1. The book contains 4000 non-repeated Hadeeths and 12000 repeated ones.
2. Many narrations are mentioned in Saheeh Al-Bukhari, but with different chain of narrators.
3. In every chapter more than one Hadeeth with the same meaning but with different chains and text are listed. The first Hadeeth in each chapter is the strongest, followed by weaker narrations in order to strengthen weaker narrations.
4. Excellent classification.
5. The book is forwarded by a detailed introduction about the basis of the sciences of Hadeeth.
Saheeh Al-Bukhari is preferred over Saheeh Muslim based on the authenticity of the Hadeeths. Imam Al-Bukhari was more strict in selecting Hadeeths (chains) than Imam Muslim . Besides considering all the conditions of a Saheeh Hadeeth, Imam Al-Bukhari stipulated a further condition that a narrator should meet the person from whom he is narrating the Hadeeth.
Imam Muslim however, did not stipulate the evidence of meeting the narrator from whom he is narrating, but according to him, it is sufficient to accept the Hadeeth of a narrator if he lives in the same period and there was the possibility of meeting the narrator from whom he is reporting the Hadeeth. So, the condition of Imam Muslim was less strict than the condition of Imam Al-Bukhari .
While Bukhari's compilation is considered the more reliable of the two, Muslim's arrangement of his material has been recognised as superior, and rightly so. While Al-Bukhari made the traditions in his collection testify to his own schedule of various points of law, Muslim left them to speak for themselves.
