Halocho #1212 - Ya'aleh VeYavo - it's Rosh Chodesh!

Today (Sunday) and tomorrow are Rosh Chodesh Kislev.

One needs to add Ya'a'leh VeYavo - יַעֲלֶה וְיָבוֹא  in the 17th Bracha of the Amida - רצה. 

If one forgot to do so during the Amida of Ma'ariv (evening prayers) - on either day - one does not need to make amends; since the Sanhedrin did not sanctify the month at night.

If one forgot to do so during Shachrit (morning prayers) or Mincha (afternoon prayers), then one has to return to the 17th Bracha of the Amida - רצה and make amends.
If one already finished the Amida - by saying Yihyu leRatzon - יהיו לרצון - then one needs to restart the Amida.

One also needs to add Ya'a'leh VeYavo - יַעֲלֶה וְיָבוֹא  - in Birkat Hamazon.

Source: Kitzur Shulchan Aruch 19:10

Chodesh Tov

- Danny
Sunday, 30 Marchesvan, 1st day Rosh Chodesh Kislev 5774