To ‘*circumcise’ means to cut the skin from the end of a male person’s sex part. When someone has done that to a person, that person is ‘*circumcised’. It is a sign that God has made a firm agreement with that person. And it is a sign that that person is a member of God’s people. God’s people became a nation. Later, they were called ‘Israelites’ or ‘the children of Israel’. They are also called the ‘Jews’.

The firm agreement that God made with Abraham is called the old firm agreement. People were *circumcised as a sign of that agreement. But when Jesus Christ came, he made a new firm agreement between God and people. And now people who belong to God do not need to be *circumcised. (See Galatians 5:6; Galatians 6:15.)

God promises a son to Abraham

v15 And God said to Abraham, ‘Sarai is your wife. But now you shall not call her Sarai. Her name shall be Sarah. v16 I will bring many good things to her. Also, I will give a son to you by her. I will bring good things to her and she shall be a mother of nations. Kings of nations shall come from her.’

v17 Then Abraham fell down so that his face was on the ground. And he laughed. He said to himself, ‘A child will not be born to me. I am 100 years of age! And Sarah will not be the mother of a child. She is 90 years of age!’ v18 And Abraham said to God, ‘I wish that Ishmael might live near to you!’ v19 God said, ‘No! Your wife Sarah shall be the mother of a son for you. You shall call him Isaac. I will make my firm agreement with him. It will be a firm agreement for his family who shall live after him. It shall be a firm agreement that shall last through all ages. v20 But I have heard your words about Ishmael. I will bring good things to him. I will make him have a big family. And I will make him have very many *descendants. He shall be the father of 12 princes. And I will make him a great nation. v21 But your son Isaac shall be born to Sarah at this season next year. I will make my firm agreement with him.’

v22 When God had finished his talk with Abraham, God went up away from him.

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