Sunan Abi Dawud 574
سنن أبي داود#574SahihNarrated Sa'id al-Khudri: The Messenger of Allah (ﷺ) saw a person praying alone. He said: Is there any man who may do good with this (man) and pray along with him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 2:184