Sahih al-Bukhari 5469

Isḥāq ibn Naṣr narrated to us: Abū Usāmah narrated to us: Hishām ibn ʿUrwah narrated to us, from his father, from Asmāʾ daughter of Abū Bakr (may God be pleased with them both), that she conceived ʿAbd Allāh ibn al-Zubayr in Mecca. She said: “I set out while I was near the end of my pregnancy and came to Medina. I stayed at Qubāʾ and gave birth at Qubāʾ. Then I brought him to the Messenger of God ﷺ and placed him in his lap. He called for a date, chewed it, then put some of his saliva into the child’s mouth. Thus the first thing to enter his stomach was the saliva of the Messenger of God ﷺ. Then he rubbed a date on his palate, prayed for him, and invoked blessing upon him. He was the first child born in Islam, and they rejoiced greatly over him, for they had been told that the Jews had bewitched them so that no child would be born to them.”