(31) باب الدُّعَاءِ لِلصِّبْيَانِ بِالْبَرَكَةِ وَمَسْحِ رُءُوسِهِمْ
Narrated Mahmud bin Ar-Rabi:
On whose face Allah's Messenger (ﷺ) had thrown water from his mouth, the water having been taken from their well while he was still a young boy (who has not yet attained the age of puberty).
Reference: Sahih al-Bukhari 6354
In-book reference: Book 80, Hadith 51
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 75, Hadith 365