I heard Kaʿb 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 Messenger of Allah 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).  

عَنْ قِصَّةِ تَبُوكَ فَوَاللَّهِ مَا أَعْلَمُ أَحَدًا أَبْلاَهُ اللَّهُ فِي صِدْقِ الْحَدِيثِ أَحْسَنَ مِمَّا أَبْلاَنِي مَا تَعَمَّدْتُ مُنْذُ ذَكَرْتُ ذَلِكَ لِرَسُولِ اللَّهِ ﷺ إِلَى يَوْمِي هَذَا كَذِبًا وَأَنْزَلَ اللَّهُ ﷻ عَلَى رَسُولِهِ ﷺ {لَقَدْ تَابَ اللَّهُ عَلَى النَّبِيِّ وَالْمُهَاجِرِينَ} إِلَى قَوْلِهِ {وَكُونُوا مَعَ الصَّادِقِينَ}