B"H

One of the limitations given to Israel, on account of that great colossal event which would mark for all time and ages G-d's descent upon Mount Sinai in order to give His laws to the people of Israel, and that they would hear Him speak unto them, was that every man should separate himself from his wife for a period of three days prior to the giving of the Torah at Sinai, as also to wash each man and woman his clothing from any apparent pollution that might have clung to his/her clothing, so as to be fit to receive those laws that proceeded forth from the mouth of Him who is Most holy. The three-day time period would have been sufficient time for any woman who had conceived of seed from her husband to discharge of that copulative seed, and then to immerse herself in water, before the Torah could be given.

In subsequent years, it was unthinkable to stand to read from the holy scroll of the Torah, while one suffered a bodily pollution. A man who accompanied with his wife on the previous night, or who had suffered a nocturnal emission, would first immerse himself in an ablution of no less than 40 seahs of water before reading from the scroll of the Torah on the following morning.

In Rebbe's days, he cancelled the need to immerse in a mikveh (ritual bath or ablution) before reading from the scroll of the Torah when one had suffered a bodily pollution, saying that the words of the Law are incapable of contracting uncleanness, as it is written: "Ki Miyemino Esh Das Lamo." כי מימינו אש דת למו (For from his right-hand has come forth unto them a fiery Law.) Just as fire cannot contract uncleanness, so too, the words of the Law (Torah) do not contract uncleanness by a person's bodily defilement.

Rebbe's enactment stands firm unto this very day. No man is required to immerse himself in a ritual bath before reading from the scroll of the Law. The lesson to be learnt here is that, in each generation, the Torah is expounded anew, and passed down unto us ad hoc, as it were, or just as it was seen in the eyes of the gedolim who studied it.

Sincerely,
David