Sahih Bukhari Volume 9, Book 88, Hadith 6929

حَدَّثَنَا أَبُو نُعَيْمٍ، عَنِ ابْنِ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتِ اسْتَأْذَنَ رَهْطٌ مِنَ الْيَهُودِ عَلَى النَّبِيِّ صلى الله عليه وسلم فَقَالُوا السَّامُ عَلَيْكَ‏.‏ فَقُلْتُ بَلْ عَلَيْكُمُ السَّامُ وَاللَّعْنَةُ‏.‏ فَقَالَ ‏"‏ يَا عَائِشَةُ إِنَّ اللَّهَ رَفِيقٌ يُحِبُّ الرِّفْقَ فِي الأَمْرِ كُلِّهِ ‏"‏‏.‏ قُلْتُ أَوَلَمْ تَسْمَعْ مَا قَالُوا قَالَ ‏"‏ قُلْتُ وَعَلَيْكُمْ ‏"‏‏

Narrated By 'Aisha : A group of Jews asked permission to visit the Prophet (and when they were admitted) they said, "As-Samu 'Alaika (Death be upon you)." I said (to them), "But death and the curse of Allah be upon you!" The Prophet said, "O 'Aisha! Allah is kind and lenient and likes that one should be kind and lenient in all matters." I said, "Haven't you heard what they said?" He said, "I said (to them), 'Wa 'Alaikum (and upon you).