Answering a greeting you are unsure about
A short instruction on what to reply.
إِذَا سَلَّمَ عَلَيْكُمْ أَهْلُ الْكِتَابِ فَقُولُوا وَعَلَيْكُمْ
If the People of the Scripture greet you, say in reply: and upon you.
The full narration
Narrated Anas bin Malik:the Prophet (ﷺ) said, "If the people of the Scripture greet you, then you should say (in reply), 'Wa'alaikum (And on you)
Source
Ṣaḥīḥ al-Bukhārī · 6258
Ṣaḥīḥ
- Agreed upon as authentic (al-Bukhārī / Muslim)