صحيح ابن خزيمه
Sahih Ibn Khuzaymah
Chapter 26
(412) بَابُ أَمْرِ الصِّبْيَانِ بِالصَّلَاةِ وَضَرْبِهِمْ عَلَى تَرْكِهَا قَبْلَ الْبُلُوغِ كَيْ يَعْتَادُوا بِهَا
412 Chapter: Command to Instruct Children to Pray and to Discipline Them for Neglecting It before Puberty So They Become Accustomed.
1 hadith
Hadith 1002
Hazrat Abdul Malik bin Rabee narrates from his father, and he from his grandfather, that the Messenger of Allah (peace and blessings be upon him) said: "Teach the child to pray at the age of seven, and at the age of ten (if he does not pray) discipline him (by beating)."