Genesis 26:23-25

From there he went up to Beersheba. That night the LORD appeared to him and said, “I am the God of your father Abraham. Do not be afraid, for I am with you; I will bless you and will increase the number of your descendants for the sake of my servant Abraham.” Isaac built an altar there and called on the name of the LORD. There he pitched his tent, and there his servants dug a well.