Parshas Vayera: Under The Tree

[3] Derashot Harav

[4] Bereishis 18:4

[5] Shemos 13:17; this lengthy Ramban contains numerous fundamental concepts relating to the basic faith of a Jew.

[6] Bereishis Rabbah 39:1

[7] Grace After Meals

[8] Rabbi Yitzchok Meir Alter zt”l, the first Gerrer Rebbe, and a contemporary of the Kotzker Rebbe/