::A Summarised Guide to Good Manners in Islam::

[MUHAMM7D]

2.17. Permissibility to greet someone who is reciting the Quran.

There is no authentic proof in the Shariah that indicates it is forbidden to greet a person who is busy reciting the Quran.
It is permissible to initiate greetings of peace to one who is reciting the Quran, and the reciter must return the greeting.
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[MUHAMM7D]

2.18. Dislike to greet someone who is relieving himself

Al-Muhaajir ibn Qunfudh related that he went to the Prophet

, who at the time was urinating. Al-Muhaajir greeted him, but the Prophet

did not respond until he performed ablution. The Messenger of Allah

then excused himself, saying, “I indeed disliked that I should remember Allah ‘Azza wa Jall (The Most Mighty And Exalted) except while being in a state of purity.” (Related by Abu Dawud)