Abraham grew up among people who worshiped other gods. But God called to Abraham and said, "Leave your country and your kindred and your father's house for a land that I will show you. I will make you the father of a great nation; I will bless you...so that you will be a blessing." Abraham listened to God. As hard as it was to leave home, he packed up his tent and all his belongings and went where God led him. Abraham spent much of his long life wondering how on earth he could be the father of a great nation when he and his wife Sarah didn't have any children, but he kept on trusting in God's promise that his descendents would be as many as the stars in heaven.
Genesis 12:1-4a and 1:1-16-1