Musannaf Ibn Abi Shaybah 34347 — Reports on al-Hasan and al-Husayn

Zirr (may Allah have mercy on him) said: Sayyiduna al-Hasan and Sayyiduna al-Husayn (may Allah be pleased with them both) would be playing on the blessed back of the Messenger of Allah (peace and blessings be upon him) while he (peace and blessings be upon him) was praying. The people would begin to move them away, and the Prophet (peace and blessings be upon him) would say: "Leave them. May my father and mother be sacrificed for them both. Whoever loves me should love these two as well."