حَدَّثَنَا سُفْيَانُ سَمِعْتُهُ مِنِ ابْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا سَلَّمَ عَلَيْكَ الْيَهُودِيُّ فَإِنَّمَا يَقُولُ السَّامُ عَلَيْكَ فَقُلْ وَعَلَيْكَ وَقَالَ مَرَّةً إِذَا سَلَّمَ عَلَيْكُمْ الْيَهُودُ فَقُولُوا وَعَلَيْكُمْ فَإِنَّهُمْ يَقُولُونَ السَّامُ عَلَيْكُمْ
مسند امام احمد بن حنبل · Hadith 4563
It was narrated from Ibn 'Umar from the Prophet (PBUH) "When a Jew greets you, what he is saying is 'as-saam 'alayka (death be upon you).” So say: 'wa 'alayka and also upon you|." And on one occasion he said: "When the jews greet you, say: 'wa 'daykum and also upon you), for what they are saving to you is ‘as-saam alaykum (death be upon you)."
Sanad
حَدَّثَنَا سُفْيَانُ سَمِعْتُهُ مِنِ ابْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ