Circumcision of the flesh (not heart) is part of the covenant
(Genesis 17:9-14)

9 _Then God said to Abraham, “As for you, you must keep my covenant, you and your descendants after you for the generations to come.
10 _This is my covenant, which you shall keep, between me and you and your offspring after you: Every male among you shall be circumcised.
11_ You shall be circumcised in the flesh of your foreskins, and it shall be a sign of the covenant between me and you.
12 _He who is eight days old among you shall be circumcised.Every male throughout your generations, whether born in your house or bought with your money from any foreigner who is not of your offspring, 
13 _both he who is born in your house and he who is bought with your money, shall surely be circumcised.So shall my covenant be in your flesh an everlasting covenant.
14 _Any uncircumcised male who is not circumcised in the flesh of his foreskin shall be cut off from his people;he has broken my covenant.”
2_

الفوائد الطبية للختان

🍃The health benefits: 

Dr. Muhammad ‘Ali al-Baar (a member of the Royal College of Surgeons in the UK and a consultant to the Islamic Medicine department of the King Fahd Centre for Medical Research in the King Abdul Aziz University in Jeddah) says in his book al-Khitaan (Circumcision): 

“Circumcision of newborn boys (i.e., within the first month of life) brings numerous health benefits, including: 

1 – Protection against local infection in the penis, which may result from the presence of the foreskin, causing tightening of the foreskin, which may lead to retention of urine or infections of the glans (tip) of the penis – which require circumcision in order to treat these problems. In chronic cases, the child may be exposed to numerous diseases in the future, the most serious of which is cancer of the penis. 

2 – Infections of the urethra. Many studies have proven that  uncircumcised boys are more exposed to infection of the urethra. In some studies the rate was 39 times more among uncircumcised boys. In other studies the rate was ten times more. Other studies showed that 95% of children who suffered from infections of the urethra were uncircumcised, whereas the rate among circumcised children did not exceed 5%. 

In children, infection of the urethra is serious in some cases. In the study by Wisewell on 88 children who suffered infections of the urethra, in 36 % of them, the same bacteria was found in the blood also. Three of them contracted meningitis, and two suffered renal failure. Two others died as a result of the spread of the micro-organisms throughout the body. 

3 – Protection against cancer of the penis:  the studies agree that cancer of the penis is almost non-existent among circumcised men, whereas the rate among uncircumcised men is not insignificant. In the US the rate of penile cancer among circumcised men is zero, whilst among uncircumcised men it is 2.2 in every 100,000 of the uncircumcised population. As most of the inhabitants of the US are circumcised, the cases of this cancer there are between 750 and 1000 per year. If the population were not circumcised, the number of cases would reach 3000. In countries where boys are not circumcised, such as China, Uganda and Puerto Rico, penile cancer represents between 12-22 % of all cancers found in men; this is a very high percentage. 

4 – Sexually transmitted diseases (STDs).  Researchers found that the STDs which are transmitted via sexual contact (usually because of fornication/adultery and homosexuality) spread more among those who are not circumcised, especially herpes, soft chancres, syphilis, candida, gonorrhea and genital warts. 

There are numerous modern studies which confirm that circumcision reduces the possibility of contracting AIDS when compared to their uncircumcised counterparts. But that does not rule out the possibility of a circumcised man contracting AIDS as the result of sexual contact with a person who has AIDS. Circumcision is not a protection against it, and there is no real way of protecting oneself against the many sexually transmitted diseases apart from avoiding fornication/adultery, promiscuity, homosexuality and other repugnant practices. (From this we can see the wisdom of Islamic sharee’ah in forbidding fornication/adultery and homosexuality). 

5 – Protection of wives against cervical cancer. Researchers have noted that the wives of circumcised men have less risk of getting cervical cancer than the wives of uncircumcised men. 

From al-Khitaan, p. 76, by Dr. Muhammad al-Baar. 

And Allaah knows best. 

Reference: Professor Wisewell, published in the American Family Doctor Magazine, issue no. 41, 1991 CE.