Imam Sadeq (a.s.) was indeed seen sitting on the ground, lamenting like a mother who has lost her son. Tears rolled down his cheeks as he said: My dear! Your occultation has stolen my sleep and has troubled my heart. It has ruined the tranquility of my heart… My dear! Your occultation has brought on my being a life-threatening catastrophe from which releasing one is difficult.
(Behaarul Anwaar, vol. 51, p. 219, Tradition no. 9)