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 become seven years old, and beat them for it (prayer) when they become ten years old; and arrange their beds (to sleep) separately.  

قَالَ رَسُولُ اللَّهِ ﷺ مُرُوا أَوْلاَدَكُمْ بِالصَّلاَةِ وَهُمْ أَبْنَاءُ سَبْعِ سِنِينَ وَاضْرِبُوهُمْ عَلَيْهَا وَهُمْ أَبْنَاءُ عَشْرِ سِنِينَ وَفَرِّقُوا بَيْنَهُمْ فِي الْمَضَاجِعِ  

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. (Using translation from Abū Dāʾūd 494)   

قَالَ رَسُولُ اللهِ ﷺ «يُؤْمَرُ الصَّبِيُّ بِالصَّلَاةِ إِذَا بَلَغَ سَبْعَ سِنِينَ فَإِذَا بَلَغَ عَشْرًا فَاضْرِبُوهُ عَلَيْهَا»  

[Machine] The Messenger of Allah ﷺ said, "When a boy reaches the age of seven, teach him prayers, and when he reaches ten, discipline him for not performing them."  

قَالَ رَسُولُ اللهِ ﷺ «إِذَا بَلَغَ الْغُلَامُ سَبْعَ سِنِينَ فَمُرُوهُ بِالصَّلَاةِ فَإِذَا بَلَغَ عَشْرًا فَاضْرِبُوهُ عَلَيْهَا»  

[Machine] The Messenger of Allah ﷺ said, "Command children to pray at the age of seven and discipline them for it at the age of ten, and separate them in their beds."  

قَالَ رَسُولُ اللهِ ﷺ مُرُوا الصِّبْيَانَ بِالصَّلَاةِ لِسَبْعِ سِنِينَ وَاضْرِبُوهُمْ عَلَيْهَا فِي عَشْرٍ وَفَرِّقُوا بَيْنَهُمْ فِي الْمَضَاجِعِ  

["مُرُوا الصَّبيَّ بالصَّلاةِ إِذَا بلَغ سَبع سِنِينَ] (*)، وإذَا بَلَغَ عَشْرَ سِنِينَ فَاضْربُوه عَلَيهَا".  

"عَلِّمُوا أَوْلادَكُم الصَّلاةَ إِذا بَلَغُوا سَبعًا، واضْرِبوهُم عَلَيهَا إِذَا بَلَغُوا عَشْرًا، وَفَرِّقُوا بَينَهُم في الْمَضَاجع".