Sunan Abi Dawud 494
سنن أبي داود#494SahihNarrated As-Saburah: The Prophet (ﷺ) said: Command a boy to pray when he reaches the age of seven years. When he becomes ten years old, then beat him for prayer
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan Sahih
Muhammad Muhyi Al-Din Abdul HamidHasan Sahih
Shuaib Al ArnautHasan Sahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 2:104