Q. The Baal HaTurim writes (Sh'mos 1:1) that the Yidden were redeemed from Egypt because they kept Shabbos and Milah there.
How is it possible that they kept Milah? It says in Sh'mos Rabbah (1:8) that they stopped keeping Milah after Yosef died.
A. Horav Shlomo Miller Shlit'a pointed out that milah was kept in Mitzraim before exiting, when they brought the korban Pesach. Also the Shevet Levy always kept bris milah (See Ramban quoting Rambam, Yebamot 46a).
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit'a