Galatians 4:4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law, 5 To redeem them that were under the law, that we might receive the adoption of sons.
The birth of Jesus Christ was executed with surgical precision, even to the millisecond. But in the interim Abraham and Sarah are losing patience, and like the Hebrews at the mount, they are tired of waiting and in this frame of mind, they become ripe candidates for temptation, which as we stated earlier, invariably would include suggestions to indulge in some sort of transgression.
Genesis 16:1 Now Sarai Abram's wife bare him no children: and she had a 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.
Observe her conclusions, that God has prevented her from bearing children. Which suggests that God changed His mind after making a promise to them. And thus, we must follow her line of reasoning to its logical end: If God has changed His mind, over what He has promised, then it is time for Sarah to take things into her own hands.
Genesis 16:3 And Sarai Abram's wife took Hagar her maid the Egyptian, after Abram had dwelt ten years in the land of Canaan, and gave her to her husband Abram to be his wife. 4 And he went in unto Hagar, and she conceived: and when she saw that she had conceived, her mistress was despised in her eyes.
May God add His blessing to the study of His word. “Good night” and God bless!