When Abram was 99 years old, the LORD appeared to him. He said, "I am the Mighty God. Walk with me and live without any blame.
References for Genesis 17:1
I will now put into practice my covenant between me and you. I will greatly increase your numbers."
Abram fell with his face to the ground. God said to him,
"As for me, this is my covenant with you. You will be the father of many nations.
"You will not be called Abram anymore. Your name will be Abraham, because I have made you a father of many nations.
I will give you many children. Nations will come from you. And kings will come from you.
"I will make my covenant with you. It will last forever. It will be between me and you and your children after you for all time to come. I will be your God. And I will be the God of all of your family after you.
"You are now living in Canaan as an outsider. But I will give you the whole land of Canaan. You will own it forever. So will your children after you. And I will be their God."
Then God said to Abraham, "As for you, you must keep my covenant. You and your children after you for all time to come must keep it.
"Here is my covenant that you and your children after you must keep. Every male among you must be circumcised.
You must be circumcised. That will be the sign of the covenant between me and you.
It must be done for all time to come. "Every male among you who is eight days old must be circumcised. That includes those who are born in your house. It also includes those who are bought with money from a stranger. Even those who are not your own children must be included.
Any male who is born in your house or bought with your money must be circumcised. "My covenant will last forever. Your body will have the mark of my covenant on it.
"Any male who has not been circumcised will be cut off from his people. He has broken my covenant."
God also said to Abraham, "As for Sarai your wife, do not call her Sarai anymore. Her name will be Sarah.
I will give her my blessing. You can be sure that I will give you a son by her. I will bless her so that she will be the mother of nations. Kings of nations will come from her."
Abraham fell with his face to the ground. He laughed and said to himself, "Will a son be born to a man who is 100 years old? Will Sarah have a child at the age of 90?"
Abraham said to God, "I wish Ishmael could receive your blessing!"
Then God said, "I will bless Ishmael. But your wife Sarah will have a son by you. And you will name him Isaac. I will establish my covenant with him. It will be a covenant that lasts forever. It will be for Isaac and for his family after him.
"As for Ishmael, I have heard you. You can be sure that I will bless him. I will give him children. I will greatly increase his numbers. He will be the father of 12 rulers. And I will make him into a great nation.
"But I will establish my covenant with Isaac. By this time next year, Sarah will have a son by you."
When he had finished speaking with Abraham, God left him.
On that very day Abraham circumcised his son Ishmael. He also circumcised every male who was born in his house or bought with his money. He did exactly as God had told him.
Abraham was 99 years old when he was circumcised.
His son Ishmael was 13.
Abraham and his son Ishmael were both circumcised on that same day.
And every male in Abraham's house was circumcised along with him. That included those who were born in his house or bought from a stranger.