When they have buried the dead and returned [from the grave], if they have time to begin and finish [the Shema] before they get to the row, they should begin, but if not they should not begin. Those who stand in the row, those on the inside are exempt, but those on the outside are obligated.

Women, slaves and minors are exempt from reciting the Shema and putting on tefillin, but are obligated for tefillah, mezuzah, and Birkat Hamazon (the blessing after meals).

One who has had a seminal emission utters the words [of the Shema] in his heart and he doesn’t say a blessing, neither before nor after. Over food he says a blessing afterwards, but not the blessing before. Rabbi Judah says: he blesses both before them and after them.

If a man was standing saying the tefillah and he remembers that he is one who has had a seminal emission, he should not stop but he should abbreviate [the blessings]. If he went down to immerse, if he is able to come up and cover himself and recite the Shema before the rising of the sun, he should go up and cover himself and recite, but if not he should cover himself with the water and recite. He should not cover himself either with foul water or with steeping water until he pours fresh water into it. How far should he remove himself from it and from excrement? Four cubits.

A zav who has had a seminal emission and a niddah from whom semen escapes and a woman who becomes niddah during intercourse require a mikveh. Rabbi Judah exempts them.