Sunan Abi Dawud 5200
سنن أبي داود#5200SahihNarrated 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)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih Muquf
Muhammad Muhyi Al-Din Abdul HamidSahih Muquf
Zubair Ali ZaiSahih
In-book reference: 43:428