Qutbul Aqtab Shaikhul Hadith Hadhrat Maulana Muhammad Zakariya Kandhlawi (Rahmatullah Alayh) writes in Aap Beti Part V:
“I can not understand why it is, that in the rules and regulations of Shari’at, each one of us looks upon himself as a clever research student. What we should actually do is that when something is not understood by us, we should tell ourselves that the rank of Nabuwwat (Prophethood) is way beyond us. Our understanding and intelligence can never reach up to that level.
For example, look at the ghusl for janaabat. All the time our Jurists have written that the command of ghusl is one which is contrary to reason (Amr ta’abbudi = command of worship) because ‘Manee’ (sperm) are exuded through a small opening of the private parts but an order is given to wash the whole body. The Jurists just called it an ‘Amr ta’abbudi’ and left it at that.
For some time I have had the habit of reading almost everything I lay my hands on. One day I red an article wherein the researches of a few doctors were mentioned. They theorised that when sperm are ejaculated from the body, at the time of desire, a certain harmful substance also is expelled through all the pores of the skin surface. This is invisible to the naked eye. If it is not removed from the skin, it is again drawn inside and absorbed by the body and causes harmful effects. For this reason it is necessary to wash it off with soap.
Reading this gave me much enjoyment because now it gave a scientific reason for explaining the need for ghusl after the ejaculation of sperm, even though for the sake of the comfort of the Ummat, Rasulullah (Sallallahu Alayhi Wasallam) had practically shown, the permission for performing ghusl after a delay.
Similarly is the case with the growing of beards of men and the braiding of women’s hair. For a long time I have been hearing that the disease of teeth rotting is so common in western countries, that young girls have to extract all their teeth and have artificial (false) teeth made for them (or have to use braces). Some time ago I read an article by certain doctors who stated that for the welfare and well being of the teeth, mens’ beards and ladies braided locks play a very important part. Similarly the doctors also proved that circumcision was most effective in avoiding many diseases like gonorrhoea and syphilis.”