Sahih al-Bukhari 4110
Book 64: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) · Narrated by Sulaiman bin Surad
Arabic
حَدَّثَنِي عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، حَدَّثَنَا يَحْيَى بْنُ آدَمَ، حَدَّثَنَا إِسْرَائِيلُ، سَمِعْتُ أَبَا إِسْحَاقَ، يَقُولُ سَمِعْتُ سُلَيْمَانَ بْنَ صُرَدٍ، يَقُولُ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ حِينَ أَجْلَى الأَحْزَابُ عَنْهُ " الآنَ نَغْزُوهُمْ وَلاَ يَغْزُونَنَا، نَحْنُ نَسِيرُ إِلَيْهِمْ ".
English translation
Narrated Sulaiman bin Surad:When the clans were driven away, I heard the Prophet (ﷺ) saying, "From now onwards we will go to attack them (i.e. the infidels) and they will not come to attack us, but we will go to them
Reference: Sahih al-Bukhari 4110, Book of Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi). English translation by Dr. Muhammad Muhsin Khan.