It is narrated from Sayyiduna Abdullah bin Khubayb al-Juhani (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "When a boy can tell his right (hand) from his left, then command him to pray."
This hadith is narrated from the Messenger of Allah (peace and blessings be upon him) only with this chain, and no one narrated it from Hisham bin Sa'd (may Allah have mercy on him) except Abdullah bin Nafi' (may Allah have mercy on him).
Hadith Referenceالمعجم الأوسط / باب الألف / 3019
Hadith Gradingمحدثین:رجاله ثقات
Hadith Takhrij«قال الهيثمي: رجاله ثقات «مجمع الزوائد ومنبع الفوائد، ج 1، ص 294»» «أخرجه الطبراني فى «الصغير» برقم: 274»