Halocho #513 - Rosh Chodesh on Sunday and Monday

This Sunday and Monday is Rosh Chodesh Adar

When the 3rd Shabbos meal continues into the night, one still inserts Retzai – רצה during Birkas Hamazon (grace after meals).

When one starts a meal on Erev Rosh Chodesh and eats a Kezayit (the size of an olive – 27 cc) of bread after dark, one inserts Ya’aleh V’Yavo – יעלה ויבוא during Birkas Hamazon.

What happens when both of the above happen together?

If Rosh Chodesh is on Sunday and one eats a Kezayis of bread after dark during the 3rd Shabbos meal, then one inserts both Retzai – רצה and Ya’aleh V’Yavo – יעלה ויבוא during Birkas Hamazon.

However, some argue that mentioning both is a contradiction – since Shabbos and Rosh Chodesh aren’t on the same day.

Therefore one should be careful not to eat after dark at the 3rd Shabbos meal when Rosh Chodesh is on Sunday.

The same concept applies to Al-Hanism in 2 weeks time when Purim will be on Sunday.

Source: Kitzur Shulchan Aruch 44:17

Shabbat Shalom uMevorach

- Danny
Thursday, 27 Shvat 5770