Narrated Iyas bin Salamah:
from his father who said: "I guided Allah's Prophet (ﷺ) and Al-Hasan and Al-Husain, on his gray mule until I brought him to the apartment of the Prophet (ﷺ), this one was in front of him, and this one behind him." (DE)
English reference (DE): Vol. 5, Book 41, Hadith 2775 (DE)
Arabic reference (DE): Book 43, Hadith 3002 (DE)