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.

قَالَ النَّبِيُّ ﷺ مُرُوا الصَّبِيَّ بِالصَّلاَةِ إِذَا بَلَغَ سَبْعَ سِنِينَ وَإِذَا بَلَغَ عَشْرَ سِنِينَ فَاضْرِبُوهُ عَلَيْهَا

The Messenger of Allah ﷺ said: “Command your children to pray when they are seven years old, and discipline them for it when they are ten years old, and separate them in their beds.”

قَالَ رَسُولُ اللَّهِ ﷺ: «مُرُوا أَوْلاَدَكُمْ بِالصَّلاَةِ وَهُمْ أَبْنَاءُ سَبْعِ سِنِينَ، وَاضْرِبُوهُمْ عَلَيْهَا وَهُمْ أَبْنَاءُ عَشْرِ سِنِينَ، وَفَرِّقُوا بَيْنَهُمْ فِي الْمَضَاجِعِ».

Waki' misunderstood the name of Dawud b. Sawar. Abu Dawud al-Tayalisi has narrated this tradition from him. He said: Anu Hamzah Sawar al-Sairafi.

Hisham ibn Sa'd reported: We entered upon Mu'adh ibn Abdullah ibn Khubayb al-Juhani. He said to his wife: When (at what age) should a boy pray? She replied: Some person of us reported: The Messenger of Allah ﷺ was asked about it; he said: When a boy distinguishes right hand from the left hand, then command him to pray.

عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ سُئِلَ عَنْ ذَلِكَ فَقَالَ إِذَا عَرَفَ يَمِينَهُ مِنْ شِمَالِهِ فَمُرُوهُ بِالصَّلاَةِ