1And when Abram was ninety years old and nine, the Lord appeared to Abram, and said unto him, I am the Almighty God; walk before me, and be thou perfect.

2 And I will make my covenant between me and thee, and will multiply thee exceedingly.

3 And Abram fell on his face: and God talked with him, saying,

4 As for me, behold, my covenant is with thee, and thou shalt be a father of many nations.

5 Neither shall thy name any more be called Abram, but thy name shall be Abraham; for a father of many nations have I made thee.

6 And I will make thee exceeding fruitful, and I will make nations of thee, and kings shall come out of thee.

7 And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee.

8 And I will give unto thee, and to thy seed after thee, the land wherein thou art a stranger, all the land of Canaan, for an everlasting possession; and I will be their God.

Source: Bible, excerpts copied from the International Bible Society
https://www.biblica.com/bible/kjv/genesis/17/

SUMMARY OF THE REMAINING OF THE CHAPTER:

God stipulated that Abraham would have to circumcise himself, his son, and all his household. He was 99 years old and his son was 13 years old. He did everything as God asked.