Now (a) Sarai Abram's wife bare him no children: and she had an handmaid, an Egyptian, whose name [was] Hagar.
(a) It seems that she had respect for God's promise, which could not be accomplished without issue.
Related Commentaries of Genesis 16:1
Genesis 16:1
1 Now Sarai Abram's wife bare him no children: and she had an handmaid, an Egyptian, whose name was Hagar.