Anas b. Malik narrates – One day Imam Hasan (a.s.) came to the Prophet (s.a.w.a.) and climbed on his chest and sat upon it. I tried to separate him from the Prophet (s.a.w.a.). The Prophet (s.a.w.a.) was upset with me and said – Woe upon you O Anas! Leave my son, the fruit of my heart. Surely the one who harasses him has harassed me and the one who harasses me has harassed Allah (Himself).
Majma' al-Zawaaed v 1 p 284 Al-Mo'jam al-Kabeer trad 2,627 Kanz al-Ummaal trad 43,410