Repeating the greeting after even a brief separation
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Etiquette of Greeting (Salam)
Repeating the greeting after even a brief separation
The Prophet (SAW) said: "If one of you meets his brother and then a tree, a wall, or a stone separates them, and he then meets him again, let him greet him [again]."
Reference: Sunan Abi Dawud, graded Hasan, on the authority of Abu Hurayrah (RA)
Explanation
Even a momentary physical separation is treated as warranting a fresh greeting upon reuniting.