Binyan Shlomo

There is a custom to say Selichos before Rosh Hashanah. Sephardim have the custom to say Selichos during the entire month of Elul, while Ashkenazim follow the custom of the Ramah (Orach Chaim 581:1) to only say Selichos for a minimum of four days prior to Rosh Hashanah – beginning with Motzaei Shabbos. The Ramah quotes from the Kol Bo that certain communities had the custom that the ba’al tefillah should also be the chazzan for the remainder of the day. The Magen Avraham explains that this is because of the general rule that when one begins a mitzvah he should complete it.