Who do the Jews believe told Abraham to leave the land of Ur?

God told Abraham that he will leave the land of Ur and go in search of the promised land that he has for him.

Explanation: God spoke to Abraham and told him to leave the land where he was born and to go to the land that he will show him, called the "promised land." God also told him that the land he would give to Abraham would also be given to his descendants.