Sahih al-Bukhari 6928
صحيح البخاري#6928Sahihحَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ سُفْيَانَ، وَمَالِكِ بْنِ أَنَسٍ، قَالاَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ دِينَارٍ، قَالَ سَمِعْتُ ابْنَ عُمَرَ ـ رضى الله عنهما ـ يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِنَّ الْيَهُودَ إِذَا سَلَّمُوا عَلَى أَحَدِكُمْ إِنَّمَا يَقُولُونَ سَامٌ عَلَيْكَ. فَقُلْ عَلَيْكَ ".
Narrated Ibn `Umar:Allah's Messenger (ﷺ) said, "When the Jews greet anyone of you they say: 'Sam'Alaika (death be upon you); so you should say; 'Wa 'Alaika (and upon you)
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 al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 88:10