Galatians 3:6-7

6 Think about our ancestor Abraham. The Bible says, ‘Abraham believed God. As a result, God accepted Abraham as right with him’. 7 So you should understand who Abraham's children really are. They are the people who trust God.

3:6Abraham was the first ancestor of the Israelite nation. He was the father of Isaac and the grandfather of Jacob.
3:6See Genesis 15:6.