Sahih al-Bukhari, Volume 8, Book 73, Hadith 206 (USC-MSA) ⓘ

Narrated Jabi: A man among us begot a boy whom he named Al-Qasim. The people said, "We will not call him (i.e., the father) by that Kuniya (Abu-l-Qasim) till we ask the Prophet about it. The Prophet said. "Name yourselves by my name, but do not call (yourselves) by my Kuniya."

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا خَالِدٌ، حَدَّثَنَا حُصَيْنٌ، عَنْ سَالِمٍ، عَنْ جَابِرٍ ـ رضى الله عنه ـ قَالَ وُلِدَ لِرَجُلٍ مِنَّا غُلاَمٌ فَسَمَّاهُ الْقَاسِمَ فَقَالُوا لاَ نَكْنِيهِ حَتَّى نَسْأَلَ النَّبِيَّ صلى الله عليه وسلم فَقَالَ ‏ "‏ سَمُّوا بِاسْمِي، وَلاَ تَكْتَنُوا بِكُنْيَتِي ‏" ‏‏.‏