Sahih Muslim — The Book of Repentance — Hadith No: 7019
Translation
It is reported on the authority of Abdullah b. K'ab and he was the guide of Ka'b as he lost his eyesight and he was the greatest scholar amongst his people and he retained in his mind many ahadith of the Companions of Allah's Messenger (ﷺ). He said:I heard my father Ka'b b. Malik, and he fas one of those three whose repentance was accepted (by Allah). He transmitted that He never lagged behind Allah's Messenger (ﷺ) from any expedition that he undertook except two expeditions; the rest of the hadith is the same, and in the tradition narrated through another chain of transmitters the words are:" That Allah's Messenger (ﷺ) set out on an expedition with a large number of persons more than ten thousand and this could not be recorded in the census register