Messenger of Allah (S) said: "Teach the boy Salat when he is seven years old, and beat him (if he does not pray) when he is ten." (Using translation from Tirmidhī 407)   

قَالَ رَسُولُ اللهِ ﷺ عَلِّمُوا الصَّبِيَّ الصَّلَاةَ ابْنَ سَبْعِ سِنِينَ وَاضْرِبُوهُ عَلَيْهَا ابْنَ عَشْرٍ  

[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  

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. (Using translation from Abū Dāʾūd 497)   

عَنْ رَسُولِ اللهِ ﷺ أَنَّهُ سُئِلَ عَنْ ذَلِكَ فَقَالَ مَتَى عَرَفَ يَمِينَهُ مِنْ يَسَارِهِ فَمُرُوهُ بِالصَّلَاةِ  

[Machine] Abdullah said, "Take care of your children in prayer and then get used to doing good deeds; for indeed, goodness is in habit."  

قَالَ عَبْدُ اللهِ حَافِظُوا عَلَى أَبْنَائِكُمْ فِي الصَّلَاةِ ثُمَّ تَعَوَّدُوا الْخَيْرَ؛ فَإِنَّمَا الْخَيْرُ بِالْعَادَةِ  

(Similarly--as no. 452 above.) (Using translation from Bukhārī 4931)   

عَنْ عَبْدِ اللهِ مُرْسَلًا  

[Machine] Abdullah said, "Take care of your children in prayer."  

قَالَ عَبْدُ اللهِ حَافِظُوا عَلَى أَبْنَائِكُمْ فِي الصَّلَاةِ  

[Machine] The Messenger of Allah ﷺ said, "A father does not have any better right upon his child than giving them a good upbringing. Ayoub ibn Musa is the son of Amr ibn Said ibn Al-Aas, and likewise..."  

قَالَ رَسُولُ اللهِ ﷺ مَا نَحَلَ وَالِدٌ وَلَدًا خَيْرًا لَهُ مِنْ أَدَبٍ حَسَنٍ أَيُّوبُ بْنُ مُوسَى هُوَ ابْنُ عَمْرِو بْنِ سَعِيدِ بْنِ الْعَاصِ وَكَذَلِكَ  

[Machine] About his righteousness and obedience to you.  

عَنْ بِرِّكَ وَطَوَاعِيَتِهِ لَكَ  

[Machine] Said bin Al-Aas is happy when I teach his child and his wife and advise him, as I have fulfilled his right and my right remains on him.  

سَعِيدُ بْنُ الْعَاصِ إِذَا عَلَّمْتُ وَلَدِي وَزَوْجَتَهُ وَأَحْجَيْتُهُ فَقَدْ قَضَيْتُ حَقَّهُ وَبَقِيَ حَقِّي عَلَيْهِ