Sahih Bukhari Volume 5, Book 59, Hadith Number 381.

Narrated By Jabir: This Verse: “When two of your parties almost Decided to fall away…” was revealed in our connection, i.e. Bani Salama and Bani Haritha and I would not have liked that, if it was not revealed, for Allah said: But Allah was their Protector… (3.122)