This gave him hope and courage, "And there builded he an altar unto the Lord who appeared unto him." Genesis 12:7. He did the same as Abel and Noah. He offered a lamb. This shows that he believed in Jesus who was to die for the sins of the world.
The Lord prospered Abraham in Canaan, and his wealth, his flocks and herds, increased wonderfully. By the example of his life the Canaanites learned of the true God.
Wherever he pitched his tent he built an altar to the true God, and morning and evening called his large family together to sacrifice and prayer.
Thus the Canaanites learned of the God of Abraham. They saw that the Lord was with him. But idol worship had so strong a hold upon them that few turned to the true God.
By and by there came a great drought in Canaan. The rain ceased to fall, the streams were dried, and the grass withered. It seemed that his whole encampment must perish.
Then Abraham journeyed to Egypt where he remained until the rains again filled the streams and caused the grass to grow in Canaan.
By this visit to Egypt the people there learned of the true God. Thus, in His own way the knowledge of a promised Saviour was taken by Abraham to the great countries of Canaan and Egypt.