Sahih Bukhari
Good Manners and Form (Al-Adab)
Volume: 008 / Book Number: 073 / Hadith Number: 214
Narrated Isma'il:
I asked Abi Aufa, "Did you see Ibrahim, the son of the Prophet ?" He said, "Yes, but he died in his early childhood. Had there been a Prophet after Muhammad then his son would have lived, but there is no Prophet after him."