Halakha Ulangan 23:13: Mishneh Torah, Reading the Shema, Mishneh Torah, Kings and Wars, Mishneh Torah, Positive Mitzvot & Sefer HaChinukh

All who are ritually unclean are bound nevertheless to read the Shema; and, while still unclean, they recite the blessings that precede and succeed it, even if it is possible for them to get rid of their uncleanness, on the same day; as is the case with those who have touched a creeping thing, or touched a woman in the period of menstruation, or touched one who has a running issue, or the couch on which anyone of these has lain, etc. Ezra and his colleagues ordained that only one who had had an emission—as an exception to all unclean classes—may not read the words of the Torah till he has ritually bathed. This ordinance was not adopted universally. The majority of the community were unable to observe it, and it fell into desuetude. All Israelites have accordingly had the custom to read the Torah and recite the Shema, notwithstanding that they had had emissions. For the words of the Torah are insusceptible of defilement, but remain always pure, as it is said, "Is it not thus, my words are like fire, saith the Lord" (Jeremiah 23:29). Even as fire is incapable of being defiled, so the words of the Torah are insusceptible of defilement, but keep their purity forever.

It is forbidden to relieve oneself within the camp or just anywhere in the field. Rather, it is a Positive Commandment to set up a latrine where the people may go and relieve themselves, as it says, “and you shall have a place outside of the camp” (Deut. 23:13).

To have a place outside the camp for sanitary purposes, as it is said, “Thou shalt have a place also without the camp” (Deut. 23:13).