رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 862
The Book of Greetings
Greeting Children
عَنْ أَنَسٍ رَضِيَ اللَّه عَنْهُ أَنَّهُ مَرَّ عَلَى صِبْيَانٍ، فَسَلَّمَ عَلَيْهِمْ، وَقَالَ: كَانَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يفعله” ((مُتَّفَقٌ عَلَيْهِ))
Anas (May Allah be pleased with him) reported that he passed by some children and greeted them. Then he said: "Messenger of Allah (ﷺ) used to do the same." [Al-Bukhari and Muslim].
Riyad as-Salihin, 862