that the Messenger of Allah (ﷺ) said: "From the complete of visiting the ill is that one of you place his hand on his forehead" - or he said - "on his hand, and ask him how he is. And shaking hands completes your greetings among each other."
Reference: Jami` at-Tirmidhi 2731 In-book : Book 42, Hadith 44 English translation : Vol. 5, Book 40, Hadith 2731
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