Book 66: Sacrifice on Occasion of Birth (`Aqiqa)
Volume 7, Book 66, Number 376: Narrated Abu Musa: A son was born to me and I took him to the Prophet who named him Ibrahim, did Tahnik for him with a date, invoked Allah to bless him and returned him to me. (The narrator added: That was Abu Musa's eldest son.) Volume 7, Book 66, Number 377: Narrated 'Aisha: A boy was brought to the Prophet to do Tahnik for him, but the boy urinated on him, whereupon the Prophet had water poured on the place of urine. Volume 7, Book 66, Number 378: Narrated Asma' bint Abu Bakr: I conceived 'Abdullah bin AzZubair at Mecca and went out (of Mecca) while I was about to give birth. I came to Medina and encamped at Quba', and gave birth at Quba'. Then I brought the child to Allah's Apostle and placed it (on his lap). He asked for a date, chewed it, and put his saliva in the mouth of the child. So the first thing to enter its stomach was the saliva of Allah's Apostle. Then he did its Tahnik with a date,