Saying Salām to Someone While They Are Bathing (Ghusl)
Source: Fatāwā Amunpuri by Shaykh Ghulam Mustafa Zaheer Amunpuri
❖ Question:
Is it permissible to say salām to someone who is taking a ritual bath (ghusl)?
❖ Answer:
Yes, it is permissible to say salām to someone who is bathing, and it is also permissible for the person bathing to reply.
Evidence from Hadith
❀ Sayyidah Umm Hānī bint Abī Ṭālib (RA) narrates:
ذهبت إلى رسول الله صلى الله عليه وسلم عام الفتح، فوجدته يغتسل وفاطمة ابنته تستره، قالت : فسلمت عليه
“I went to the Messenger of Allah ﷺ in the year of the Conquest (of Makkah). I found him performing ghusl while his daughter Fāṭimah was screening him. I greeted him with salām.”
(Ṣaḥīḥ al-Bukhārī: 357; Ṣaḥīḥ Muslim: 336)

It is allowed to greet someone with salām while they are bathing, and they may also return the greeting.