After Sarah gave birth to Isaac, she had good reason to envisage the fulfillment of the rest of God’s promise to Abraham.
(‏ تك ١٧ :‏ ١٦‏ )‏ وَبَعْدَ أَنْ وَلَدَتْ إِسْحَاقَ ،‏ بَاتَ لَدَيْهَا أَسْبَابٌ وَجِيهَةٌ لِتَتَصَوَّرَ كَيْفَ سَيُتَمِّمُ ٱللهُ كَامِلًا وَعْدَهُ لِإِبْرَاهِيمَ .‏