For most months, on the first day (Rosh Hodesh) we say the Hallel service between Shacharit and Mussaf. For the first day of Tishrei (Rosh Hashanah), however, we do not say Hallel. Why is it not ...
Artscroll Hebrew Siddurim - and 1 2 among others have at the end of Hallel to say the following Posuk. וְאַבְרָהָם זָקֵן בָּא בַּיָּמִים וַה' בֵּרַךְ אֶת-אַבְרָהָם בַּכֹּל Artscroll says it is a ...