Language:
كتاب العقيقة
71  
Sacrifice on Occasion of Birth (`Aqiqa)
(1)
Chapter: The naming of a newly born child, Al-'Al-'Aqiqa and its Tahnik
(1)
باب تَسْمِيَةِ الْمَوْلُودِ غَدَاةَ يُولَدُ، لِمَنْ لَمْ يَعُقَّ عَنْهُ، وَتَحْنِيكِهِ
Sahih al-Bukhari 5467

Narrated Abu Musa:

A son was born to me and I took him to the Prophet (ﷺ) 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.)

حَدَّثَنِي إِسْحَاقُ بْنُ نَصْرٍ، حَدَّثَنَا أَبُو أُسَامَةَ، قَالَ حَدَّثَنِي بُرَيْدٌ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى ـ رضى الله عنه ـ قَالَ وُلِدَ لِي غُلاَمٌ، فَأَتَيْتُ بِهِ النَّبِيَّ صلى الله عليه وسلم فَسَمَّاهُ إِبْرَاهِيمَ، فَحَنَّكَهُ بِتَمْرَةٍ، وَدَعَا لَهُ بِالْبَرَكَةِ وَدَفَعَهُ إِلَىَّ، وَكَانَ أَكْبَرَ وَلَدِ أَبِي مُوسَى‏.‏
Reference : Sahih al-Bukhari 5467
In-book reference : Book 71, Hadith 1
USC-MSA web (English) reference : Vol. 7, Book 66, Hadith 376
  (deprecated numbering scheme)