Asma bint Abu Bakr set out when she emigrated while she was pregnant with Abdullah bin Zubayr. She arrived at Quba and gave birth to Abdullah there. After giving birth, she went out to the Messenger of Allah ﷺ so that he might perform the tahnik for the child. The Messenger of Allah ﷺ took the baby from her, placed him in his lap, and called for a date.Ayesha said, "We spent some time searching for it before we found it." He chewed the date and then placed it into the baby's mouth, so the very first thing to enter his stomach was the saliva of the Messenger of Allah ﷺ.Asma then said, "He then wiped him, prayed for him, and named him Abdullah. Later, when he was seven or eight years old, he came to pledge allegiance to the Messenger of Allah ﷺ, having been instructed to do so by Zubayr. The Messenger of Allah ﷺ smiled when he saw him approaching, and then accepted his pledge."
خرجت أسماء بنت أبي بكر حين هاجرت وهي حبلى بعبد الله بن الزبير، فقدمت قباء، فنفست بعبد الله بقباء، ثم خرجت حين نفست إلى رسول الله ﷺ ليحنكه، فأخذه رسول الله ﷺ منها فوضعه في حجره ثم دعا بتمرة قال: قالت عائشة: فمكثنا ساعة نلتمسها قبل أن نجدها فمضغها، ثم بصقها في فيه، فإن أول شيء دخل بطنه لريق رسول الله ﷺ. ثم قالت أسماء: ثم مسحه وصلى عليه وسماه عبد الله. ثم جاء وهو ابن سبع سنين أو ثمان ليبايع رسول الله ﷺ وأمره بذلك الزبير فتبسم رسول الله ﷺ حين رآه مقبلا إليه ثم بايعه.
Muslim narrated it in the Book of Manners (25:2146), on the authority of Hakam bin Musa Abu Salih, who said, Shuayb bin Ishaq narrated to us, Hisham bin Urwa informed me, Urwa bin Zubayr and Fatimah bint Munzir bin Zubayr narrated to me, both of whom said, and then they related it.