Imam Jafar Al-Sadiq (as)

Imam Ja'far Al-Sadiq<as> Said:“When Imam Husain<as> was martyred, the heavens and the earth and all that is in it lamented and said: “Lord, permit us to destroy all the creatures and to renew the earth again as they have considered Your sanctity lawful (to defile) and have slain Your chosen one.” So the Almighty Allah revealed to them, “O Angels, O My heavens and O My earth! Rest assured!” Then He removed a curtain behind which were visible, Muhammad and the twelve successors. He held the hand of the Qa'im (Al-Mahdi) from among them and said: O My angels and O My heavens and O My earth, I will help them. He repeated it thrice.”---Ref; (Kafi, Vol. 1, Pg. 534)++++ (Amir ul Momineen Imam Ali<as> said:
"By Allah, I will be killed along with these two sons of mine (Hassan and Hussain), and Allah will send a man (Al-Mahdi) of my descendants to avenge our blood, and he will be absent from people, so that people of delusion are defected till the ignorant say: Allah doesn't care about Aal-e- Mohammad<saww>
Ref: -Bihar vol.51 p.112