Sayyidah Asma (may Allah be pleased with her) narrated: "When I gave birth to Abdullah bin al-Zubayr, he was brought to the Prophet (peace and blessings be upon him). He (peace and blessings be upon him) stroked him affectionately and named him Abdullah. Later, when he was seven or eight years old, he came to pledge allegiance to the Prophet (peace and blessings be upon him); al-Zubayr (may Allah be pleased with him) had ordered him to do so. The Messenger of Allah (peace and blessings be upon him) smiled when he saw him coming, and accepted his pledge."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20581