Sahih al-Bukhari, Hadith 4471 ⓘ
Narrated Abu 'Is-haq: I asked Zaid bin Al-Arqam, "In how many Ghazawat did you take part in the company of Allah's Apostle?" He replied, "Seventeen." I further asked, "How many Ghazawat did the Prophet fight?" He replied, "Nineteen."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ رَجَاءٍ، حَدَّثَنَا إِسْرَائِيلُ، عَنْ أَبِي إِسْحَاقَ، قَالَ سَأَلْتُ زَيْدَ بْنَ أَرْقَمَ ـ رضى الله عنه ـ كَمْ غَزَوْتَ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ سَبْعَ عَشْرَةَ. قُلْتُ كَمْ غَزَا النَّبِيُّ صلى الله عليه وسلم قَالَ تِسْعَ عَشْرَةَ.
also referenced under: Book 64, Hadith 486 (In-Book) & Volume 5, Book 59, Hadith 747 (USC-MSA)