Narrated '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 ﷺ 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).

حَدَّثَنَا أَبُو نُعَيْمٍ، عَنِ ابْنِ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتِ اسْتَأْذَنَ رَهْطٌ مِنَ الْيَهُودِ عَلَى النَّبِيِّ ﷺ 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 ".