Some time was spent before we were able to find them. He (the Holy Prophet) chewed them and then put his saliva in his mouth. The first thing that entered his stomach, was the saliva of Messenger of Allah ﷺ. Asma' said: He then rubbed him and blessed him and gave him the name of Abdullah. He ('Abdullah) went to him (the Holy Prophet) when he had attained the age of seven or eight years in order to pledge allegiance to Messenger of Allah ﷺ as Zubair had commanded him to do. Messenger of Allah ﷺ smiled when he saw him coming towards him and then accepted his allegiance. (Using translation from Muslim 2146a)
عَنْ عُرْوَةَ وَفَاطِمَةَ بِنْتِ الْمُنْذِرِ أَنَّهُمَا قَالَا خَرَجَتْ أَسْمَاءُ بِنْتُ أَبِي بَكْرٍ حِينَ هَاجَرَتْ وَهِيَ حُبْلَى بِعَبْدِ اللهِ بْنِ الزُّبَيْرِ فَقَدِمَتْ قِبَاءَ فَنُفِسَتْ بِعَبْدِ اللهِ بِهَا ثُمَّ خَرَجَتْ حِينَ نُفِسَتْ إِلَى رَسُولِ اللهِ ﷺ لِتَحْنِكَهُ «فَأَخَذَهُ رَسُولُ اللهِ ﷺ مِنْهَا فَوَضَعَهُ فِي حِجْرِهِ ثُمَّ دَعَا بِتَمْرَةٍ» قَالَتْ عَائِشَةُ فَمَكَثْنَا سَاعَةً نَلْتَمِسُهَا قَبْلَ أَنْ نَجِدَهَا «فَمَضَغَهَا ثُمَّ وَضَعَهَا فِي فِيهِ» فَإِنَّ أَوَّلَ شَيْءٍ دَخَلَ بَطْنَهُ لَرِيقُ رَسُولِ اللهِ ﷺ قَالَتْ أَسْمَاءُ «ثُمَّ مَسَحَهُ وَصَلَّى عَلَيْهِ وَسَمَّاهُ عَبْدَ اللهِ ثُمَّ جَاءَ بَعْدُ وَهُوَ ابْنُ سَبْعِ سِنِينَ أَوْ ثَمَانِ سِنِينَ لِيُبَايِعَ رَسُولَ اللهِ ﷺ أَمَرَهُ بِذَلِكَ الزُّبَيْرُ فَتَبَسَّمَ رَسُولُ اللهِ ﷺ حِينَ رَآهُ مُقْبِلًا إِلَيْهِ ثُمَّ بَايَعَهُ» بَابٌ