Sahih Muslim 4676
صحيح مسلم#4676Sahihحَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ، حَدَّثَنَا بَهْزٌ، حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، حَدَّثَنَا ثَابِتٌ، عَنْ أَنَسٍ، أَنَّ أَصْحَابَ، مُحَمَّدٍ صلى الله عليه وسلم كَانُوا يَقُولُونَ يَوْمَ الْخَنْدَقِ نَحْنُ الَّذِينَ بَايَعُوا مُحَمَّدًا عَلَى الإِسْلاَمِ مَا بَقِينَا أَبَدًا أَوْ قَالَ عَلَى الْجِهَادِ . شَكَّ حَمَّادٌ وَالنَّبِيُّ صلى الله عليه وسلم يَقُولُ " اللَّهُمَّ إِنَّ الْخَيْرَ خَيْرُ الآخِرَهْ فَاغْفِرْ لِلأَنْصَارِ وَالْمُهَاجِرَهْ " .
It has been narrated (through a still difterent chain of transmitters) by Anas that the Companions of Muhammad (ﷺ) were chanting on the day of the Battle of the Ditch:We are those who have sworn allegiance to Muhammad (And made a covenant with him) to follow Islam as long as we live. Hammad is not sure whether Anas said:" Ala'l-Islam" or," Ala'l-Jihad". And the Prophet (ﷺ) was chanting: O God, the real good is the good of the Hereafter, So forgive Thou the Ansar and the Muhajirs
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 32:158