and he said to him, 'Leave your country and your relatives and come to the country that I will show you.' So he left the country of the Chaldeans and went to live in Haran, and from there after the death of his father, God caused him to move into this country where you now live. He gave him no property in it, not a single foot, but he promised to give it to him and his posterity after him permanently, though he had no children at that time. read more.
This was what God said: 'His descendants will be strangers, living in a foreign land, and they will be enslaved and misused for four hundred years, and I will sentence the nation that has enslaved them,' God said, 'and afterward they will leave that country and worship me on this spot.' And he made the agreement of circumcision with him, and so Abraham became the father of Isaac and circumcised him on the eighth day, and Isaac became the father of Jacob, and Jacob of the twelve patriarchs.

Hebrews 11:8-17

Faith enabled Abraham to obey when God summoned him to leave his home for a region which he was to have for his own, and to leave home without knowing where he was going. Faith led him to make a temporary home as a stranger in the land he had been promised, and to live there in his tents, with Isaac and Jacob, who shared the promise with him. For he was looking forward to that city with the sure foundations, designed and built by God. read more.
Faith made even Sarah herself able to have a child, although she was past the time of life for it, because she thought, that he who had made the promise would keep it. And so from one man, for any prospect of descendants as good as dead, there sprang a people in number like the stars in the heavens or the countless sands on the seashore. All these people lived all their lives in faith, and died without receiving what had been promised; they only saw it far ahead and welcomed the sight of it, recognizing that they themselves were only foreigners and strangers here on earth. For men who recognize that show that they are in search of a country of their own. And if it had been the country from which they had come to which their thoughts turned back, they would have found an opportunity to return to it. But, as it is, their aspirations are for a better, a heavenly country! That is why God is not ashamed to be called their God, for he has prepared a city to receive them. Faith enabled Abraham, when he was put to the test, to offer Isaac as a sacrifice. He who had accepted God's promises was ready to sacrifice his only son,