Sahih al-Bukhari 2501, 2502
Narrated `Abdullah bin Hisham:
that his mother Zainab bint Humaid took him to the Prophet (ﷺ) and said, "O Allah's Messenger (ﷺ)! Take the 
pledge of allegiance from him." But he said, "He is still too young for the pledge," and passed his 
hand on his (i.e. `Abdullah's) head and invoked for Allah's blessing for him. Zuhra bin Ma`bad stated 
that he used to go with his grandfather, `Abdullah bin Hisham, to the market to buy foodstuff. Ibn 
`Umar and Ibn Az-Zubair would meet him and say to him, "Be our partner, as the Prophet (ﷺ) invoked 
Allah to bless you." So, he would be their partner, and very often he would win a camel's load and 
send it home.
حَدَّثَنَا أَصْبَغُ بْنُ الْفَرَجِ، قَالَ أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ وَهْبٍ، قَالَ أَخْبَرَنِي سَعِيدٌ، عَنْ زُهْرَةَ بْنِ مَعْبَدٍ، عَنْ جَدِّهِ عَبْدِ اللَّهِ بْنِ هِشَامٍ ـ وَكَانَ قَدْ أَدْرَكَ النَّبِيَّ صلى الله عليه وسلم ـ وَذَهَبَتْ بِهِ أُمُّهُ زَيْنَبُ بِنْتُ حُمَيْدٍ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَتْ يَا رَسُولَ اللَّهِ بَايِعْهُ‏.‏ فَقَالَ ‏
"‏ هُوَ صَغِيرٌ ‏"‏‏.‏ فَمَسَحَ رَأْسَهُ وَدَعَا لَهُ‏.‏ وَعَنْ زُهْرَةَ بْنِ مَعْبَدٍ، أَنَّهُ كَانَ يَخْرُجُ بِهِ جَدُّهُ عَبْدُ اللَّهِ بْنُ هِشَامٍ إِلَى السُّوقِ فَيَشْتَرِي الطَّعَامَ فَيَلْقَاهُ ابْنُ عُمَرَ وَابْنُ الزُّبَيْرِ ـ رضى الله عنهم ـ فَيَقُولاَنِ لَهُ أَشْرِكْنَا، فَإِنَّ النَّبِيَّ صلى الله عليه وسلم قَدْ دَعَا لَكَ بِالْبَرَكَةِ فَيَشْرَكُهُمْ، فَرُبَّمَا أَصَابَ الرَّاحِلَةَ كَمَا هِيَ، فَيَبْعَثُ بِهَا إِلَى الْمَنْزِلِ‏.‏