(44) باب غَزْوَةِ الأَحْزَابِ وَهِيَ الْخَنْدَقُ
According to still another version of the tradition narrated by the same authority, and handed down through a different chain of transmitters, it has been reported that they (the Companions of the Holy Prophet) were reciting rajaz verses and the Messenger of Allah (ﷺ) was (reciting) with them. And they were chanting:
O God, there is no good but the good of the Hereafter. So help Thou the Ansar and the Muhajirs. Shaiban substituted" So forgive Thou" for" So help Thou".
Reference: Sahih Muslim 1805 c
In-book reference: Book 32, Hadith 157
USC-MSA web (English) reference(deprecated numbering scheme): Book 19, Hadith 4447