Is it disliked to greet with the salam one who is reciting the Qur'an, praying, or occupied with knowledge?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: Is it disliked to greet with the salam one who is reciting the Qur'an, one who is praying, or one who is occupied with knowledge or the like?

Answer:
Yes, one who is occupied is not greeted with the salam because he is preoccupied with responding. This applies to one who is occupied with eating or one who is occupied in conversation with individuals. As for the one who is praying, he is greeted with the salam and he responds with a gesture. Yes.