Musannaf Ibn Abi Shaybah 40254 — Reports on the tribulation

It is narrated from Sayyidah Asma bint Yazid (may Allah be pleased with her) that she said: The Messenger of Allah (peace and blessings be upon him) said: "You have no cause to fear this Dajjal. If he emerges during my lifetime, I will be the one to confront him, and if he emerges after my death, Allah Almighty will be the guardian over every Muslim."