And Allah, Exalted is He, says:

“They say, ‘The Most Merciful has taken a son.’ Glory be to Him! Rather, they are honoured servants. They do not speak before He speaks, and they act at His command. He knows what is before them and what is behind them, and they intercede only for those with whom He is pleased, while they stand in awe of Him.”
[Al-Anbiyā’: 26–28]

And He says:

“They ask you about the Hour: when will it arrive? Say, ‘Knowledge of it rests only with my Lord. None but He will reveal it at its appointed time. It weighs heavily upon the heavens and the earth.’”
[Al-Aʿrāf: 187]

That is, knowledge of it is hidden from the inhabitants of the heavens and the earth.

And Allah, Exalted is He, says:

“The Hour is surely coming; I would almost conceal it.”
[Tā Hā: 15]

That is, “I conceal it from Myself, so how could I disclose it to you?”

And He says:

“Say, ‘None in the heavens and the earth knows the unseen except Allah.’”
[Al-Naml: 65]

And He says of the angels:

“We descend only at your Lord’s command.”
[Maryam: 64]

And He says:

“Your only god is Allah, other than whom there is no god. His knowledge encompasses all things.”
[Tā Hā: 98]

Continuing to His words:

“Voices will be humbled before the Most Merciful, and you will hear nothing but a whisper. On that Day, intercession will be of no benefit except that of one whom the Most Merciful has permitted and whose words He approves. He knows what is before them and what is behind them, but they cannot encompass Him in knowledge.”
[Tā Hā: 108–110]