Sunan Abi Dawud 456
سنن أبي داود#456Da'ifSamurah reported that he wrote (a letter) to his sons:After (praising Allah and blessing the Prophet) that: The Messenger of Allah (ﷺ) used to command us to build mosques in our localities and keep them well and clean
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
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 2:66