Sahih al-Bukhari, Volume 6, Book 60, Hadith 364 (USC-MSA) ⓘ
Narrated Jabir: We were one thousand and four hundred on the Day of Al-Hudaibiya.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنْ جَابِرٍ، قَالَ كُنَّا يَوْمَ الْحُدَيْبِيَةِ أَلْفًا وَأَرْبَعَمِائَةٍ.
also referenced under: Book 65, Hadith 4840 (In-Book) & Hadith 4840 (DarusSalam)