Sahih Muslim 43
صحيح مسلم#43Sahihحَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، أَنْبَأَنَا النَّضْرُ بْنُ شُمَيْلٍ، أَنْبَأَنَا حَمَّادٌ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِنَحْوِ حَدِيثِهِمْ غَيْرَ أَنَّهُ قَالَ " مِنْ أَنْ يَرْجِعَ يَهُودِيًّا أَوْ نَصْرَانِيًّا " .
A similar hadith has been reported on the authority of Anas (with another chain of transmitters) with the exception of these words:that he again becomes a Jew or a Christian
Scholarly Authentication
The label above is the grade most of these scholars gave, each scholar counted once — 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. When they judged only its chain of narrators (“Isnaad”), the label says “Sound chain”. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
Sahih Muslim 43 is the standard (Abd al-Baqi) number; this narration is #167 in the MuslimGPT index.
In-book reference: 1:74