Abu Hurayra reported that the Messenger of Allah, may Allah blesshim and grant him peace, took al-Hasan or al-Husayn by the hand and thenput his feet on top of his own feet and said, "Climb up." (TR)
English reference (TR): Book 14, Hadith 270 (TR)
Arabic reference (TR): Book 1, Hadith 270 (TR)