Sahih al-Bukhari 4678
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · "O you who believe! Be afraid of Allah, and be with those who are true (in words and deeds) ." (V.9:119)
Narrated `Abdullah bin Ka`b:
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ ، حَدَّثَنَا اللَّيْثُ ، عَنْ عُقَيْلٍ ، عَنِ ابْنِ شِهَابٍ ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ عَبْدِ اللَّهِ بْنِ كَعْبِ بْنِ مَالِكٍ ، أَنَّ عَبْدَ اللَّهِ بْنَ كَعْبِ بْنِ مَالِكٍ ـ وَكَانَ قَائِدَ كَعْبِ بْنِ مَالِكٍ ـ قَالَ سَمِعْتُ كَعْبَ بْنَ مَالِكٍ ، يُحَدِّثُ حِينَ تَخَلَّفَ عَنْ قِصَّةِ، تَبُوكَ. فَوَاللَّهِ مَا أَعْلَمُ أَحَدًا أَبْلاَهُ اللَّهُ فِي صِدْقِ الْحَدِيثِ أَحْسَنَ مِمَّا أَبْلاَنِي، مَا تَعَمَّدْتُ مُنْذُ ذَكَرْتُ ذَلِكَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم إِلَى يَوْمِي هَذَا كَذِبًا، وَأَنْزَلَ اللَّهُ عَزَّ وَجَلَّ عَلَى رَسُولِهِ صلى الله عليه وسلم {لَقَدْ تَابَ اللَّهُ عَلَى النَّبِيِّ وَالْمُهَاجِرِينَ} إِلَى قَوْلِهِ {وَكُونُوا مَعَ الصَّادِقِينَ}
I heard Ka`b bin Malik talking about the story of the battle of Tabuk when he remained behind, "By Allah, I do not know anyone whom Allah has helped for telling the truth more than me since I mentioned that truth to Allah's Messenger (ﷺ) till today, I have never intended to tell a lie. And Allah revealed to His Apostle: "Verily! Allah has forgiven the Prophet, the Muhajirin............ and be with those who are true (in words and deeds)." (9.117-119) (See Hadith No. 702 Vol 5).