Narrated 'Abdullah bin Kab:
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 Apostle 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).
Sahih al-Bukhari, Vol. 6, Book of Prophetic Commentary on the Qur'an, Hadith 200
Sahih al-Bukhari, Book of Prophetic Commentary on the Qur'an, Hadith 200