Sayyidah Asma' bint Abi Bakr (may Allah be pleased with her) said: I came to Sayyidah Aishah (may Allah be pleased with her) and the people were standing, and she too was praying. I asked: What is the matter with the people? She pointed with her hand towards the sky and said: Subhan Allah (Glory be to Allah). I asked: Is it a sign? She indicated with her head: yes. I stood until I began to faint, and I started pouring water over my head. (After finishing the prayer) the Messenger of Allah (peace and blessings be upon him) praised Allah and extolled Him as He deserves, then said: "There was nothing that was shown to me except that I have seen it in this place of mine, even Paradise and Hell. And it has been revealed to me that you will be tried in the graves like - or close to, the narrator does not remember which word Asma' (may Allah be pleased with her) said - the trial of the Dajjal, the False Messiah. Each one of you will be approached and it will be said to him: What do you know about this man? The believer will say: Muhammad is the Messenger of Allah; he came to us with clear proofs and guidance, so we responded and followed. Then it will be said: Sleep in goodness; we knew that you believed in Allah. And the hypocrite - or the doubter, the narrator does not remember which word was said - will say: I do not know anything; I heard the people saying something, so I said the same."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20687