"The Messenger of Allah . Verily, Allah, with Him (alone) is the knowledge of the Hour up to His saying: 'Verily, Allah is All-Knower, All-Aware (of things).' Then he said: 'No, by the One who sent Muhammad with the truth, with guidance and glad tidings, I did not know him more than any man among you. That was Jibril, peace be upon you, who came down in the form of Dihyah Al-Kalbi.'"

The Prophet (ﷺ) said, "The keys of the Unseen are five." And then he recited: 'Verily, the knowledge of the Hour is with Allah (alone).' (31.34)

I heard Allah's Messenger (ﷺ) as saying this one month before his death: You asked me about the Last Hour whereas its knowledge is with Allah. I, however, take an oath and say that none upon the earth, the created beings (from amongst my Companions), would survive at the end of one hundred years.

“The Messenger of Allah (ﷺ) came out one day to the people, and a man came to him and said: ‘O Messenger of Allah, when will the Hour be?’ He said: ‘The one who is asked about it does not know more than the one who is asking. But I will tell you of its portents. When the slave woman gives birth to her mistress, that is one of its portents. When the barefoot and naked become leaders of the people, that is one of its portents. When shepherds compete in constructing buildings, that is one of its portents. (The Hour) is one of five (things) which no one knows except Allah.’ Then the Messenger of Allah (ﷺ) recited the words: “Verily, Allah, with Him (alone) is the knowledge of the Hour, He sends down the rain, and knows that which is in the wombs. (to the end of the Verse).”

Ask me (about religious matters), but they (the Companions) were in awe of asking him. Then came a man, and sat near his knees and said: O Messenger of Allah, what is al-Islam? So he (the Holy Prophet) replied: of its signs. The (Hour) is one of the five things of the unseen. No one knows them except Allah. Then (the Holy Prophet) recited (the folowing verse):" Verily Allah! with Him alone is the knowledge of the Hour and He it is Who sends down the rain and knows that which is in the wombs. And no soul knows what it shall earn on the morrow and a soul knows not in what land it shall die. Verily Allah is Knowing, Aware." He (Abu Huraira) said: Then the person stood up (and made his way). Then the Messenger of Allah (ﷺ) said: Bring him back to me. He was searched for, but they could not find him. The Messenger of Allah (ﷺ) thereupon said: He was Gabriel and he wanted to teach you when you did not ask.