Laws of Immersion Night on Rosh Hashanah

What should a woman do if her immersion night falls on Rosh Hashanah night?

Good morning

You did not specify in your question what exactly you wanted to ask, so I will try to detail several aspects.

A. Regarding the fulfillment of the mitzvah of marital relations on the night of Rosh Hashanah, the poskim are divided on whether there is a prohibition or not, but according to all opinions, when the immersion night falls on Rosh Hashanah, it is a mitzvah and not a prohibition. It is very appropriate for the husband to immerse in the morning to pray the prayers of the holy day in purity.

B. Regarding the preparations for immersion, the law is the same as for immersing on Shabbat night, she should make all preparations on the eve of the holiday and be careful not to touch things that are barriers until the immersion, and arrange her hair so that it does not tangle and remains combed until the immersion. When she immerses in the evening, she should examine her entire body to ensure it remains clean and comb her hair with her fingers to ensure it is not tangled.

C. Even if the immersion is on the second night of Rosh Hashanah, all preparations are made on the eve of the holiday, and when she immerses, she examines her body and slightly combs with her fingers. If she becomes slightly dirty, she is allowed to wash part of her body with warm water, but she should not wash her entire body with hot water.

D. If the immersion falls on the second night of Rosh Hashanah, it is permissible for the woman to eat meat on the first day, as eating is a mitzvah, but she should be careful to clean her teeth thoroughly before immersion, so that no meat remains as a barrier between her teeth.

Mishnah Berurah, Siman 581, Se'if Katan 26

Shulchan Aruch, Yoreh De'ah, Siman 199, Se'if 5-6

Shulchan Aruch, Yoreh De'ah, Siman 198, Taz, Se'if Katan 24, 25