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Takhrij Hadith 308: "Whenever two of the companions…"
Narrated by Abu Madinah al-Darimi:
“
Whenever two of the companions of Muhammed ﷺ met and then wished to part, one of them would recite: {By Time! Indeed, mankind is in loss} until he completed the surah, and then each of them would give salam to the other.”