the Prophet ﷺ said, "If the people of the Scripture greet you, then you should say (in reply), 'Wa'alaikum (And on you).' " (Using translation from Bukhārī 6258)
"إِذا سلَّمَ عليكُمْ أحدٌ مِنْ أهْلِ الكتابِ فَقُولوا: وعليكُمْ".
the Prophet ﷺ said, "If the people of the Scripture greet you, then you should say (in reply), 'Wa'alaikum (And on you).' "
قَالَ النَّبِيُّ ﷺ إِذَا سَلَّمَ عَلَيْكُمْ أَهْلُ الْكِتَابِ فَقُولُوا وَعَلَيْكُمْ
"When any of the People of the Book greets you with Salam (peace), then say, Wa 'alaikum(and also upon you)."
قَالَ رَسُولُ اللَّهِ ﷺ إِذَا سَلَّمَ عَلَيْكُمْ أَحَدٌ مِنْ أَهْلِ الْكِتَابِ فَقُولُوا وَعَلَيْكُمْ
[Machine] "That the Prophet ﷺ said, when the People of the Book greet you with peace, respond with "upon you (be peace)". And the other person would say "and upon you".
أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا سَلَّمَ عَلَيْكُمْ أَهْلُ الْكِتَابِ فَقُولُوا عَلَيْكُمْ وَقَالَ الْآخَرُ وَعَلَيْكُمْ
"When any of the People of the Book greets you with Salam (peace), then say, Wa 'alaikum(and also upon you)." (Using translation from Ibn Mājah 3697)
قَالَ رَسُولُ اللهِ ﷺ إِذَا سَلَّمَ عَلَيْكُمْ أَهْلُ الْكِتَابِ فَقُولُوا وَعَلَيْكُمْ