from Abu Hurairah that the Prophet (ﷺ) said: "The rider gives the Salam to the walking person, and the walking person to the sitting person and the few to the many." Ibn Al-Muthanna added in his narration: "And the young one gives the Salam to the elder."
Jami` at-Tirmidhi Book 42, Hadith 16
← Previous Hadith that the Prophet (ﷺ) passed by a gathering in which the Muslims and the Jews were mixed, so he gave the Salam to them.

Jami` at-Tirmidhi Book 42, Hadith 15 Next Hadith → from Abu Hurairah that the Prophet (ﷺ) said: "The young one gives the Salam to the elder, the one passing the by to the one sitting and the few to the many."

Jami` at-Tirmidhi Book 42, Hadith 17