Genesis 16:1-2 King James Version (KJV)
16 Now Sarai Abram's wife bare him no children: and she had an handmaid, an Egyptian, whose name was Hagar.
2 And Sarai said unto Abram, Behold now, the Lord hath restrained me from bearing: I pray thee, go in unto my maid; it may be that I may obtain children by her. And Abram hearkened to the voice of Sarai.
Genesis 16:1-2 New International Version (NIV)
Hagar and Ishmael
16 Now Sarai, Abram’s wife, had borne him no children. But she had an Egyptian slave named Hagar; 2 so she said to Abram, “The Lord has kept me from having children. Go, sleep with my slave; perhaps I can build a family through her.”
Abram agreed to what Sarai said.