Halocho #1296 - Rosh Chodesh on Sunday and Monday

This Sunday and Monday will be Rosh Chodesh Adar-II.

When the 3rd Shabbat meal continues into the night, one still inserts  רְצֵה during Birkat Hamazon. 

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  יַעֲלֶה וְיָבוֹא 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 Shabbat meal, then one inserts both רְצֵה and  יַעֲלֶה וְיָבוֹא during Birkas Hamazon. 

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

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

The same concept applies to  עַל הַנִּסִּים  in 2 weeks time when Purim will be on Sunday. 

Source: Kitzur Shulchan Aruch 44:17

Shabbat Shalom uMevorach

- Danny
Thursday, 27 Adar-I 5774