Genesis 26:23-25

From there, Isaac moved his camp to Beersheba. That very night, YAHWEH appeared before him and said: “I am the God of Abraham your father. You will never need to fear a thing for I am with you and I will greatly bless you. Your children will flourish and succeed because of the promises I gave my servant Abraham.” So Isaac built an altar, prayed, and worshiped YAHWEH there. He pitched his tent there, and his servants started digging another well.