By faith Abraham obeyed when he was called to go out to the place which he would receive as an inheritance.  And he went out, not knowing where he was going. By faith he dwelt in the land of promise as in a foreign country, dwelling in tents with Isaac and Jacob, the heirs with him of the same promise; for he waited for the city which has foundations, whose builder and maker is God.  

Heb 11:8-10  (NKJV)