(147) باب فِي الرَّجُلِ يُفَارِقُ الرَّجُلَ ثُمَّ يَلْقَاهُ أَيُسَلِّمُ عَلَيْهِ
Narrated AbuHurayrah:
When one of you meets his brother, he should salute him, then if he meets him again after a tree, wall or stone has come between them, he should also salute him.Mu'awiyah said: 'Abd al-Wahhab b. Bakht transmitted a similar tradition to me from Abu al-Zinad, from al-A'raj, from Abu Hurairah, from the Messenger of Allah (ﷺ).
Reference: Sunan Abi Dawud 5200
In-book reference: Book 43, Hadith 428
English translation: Book 42, Hadith 5181