Amos 3:7

Now Yahweh said, “Shall I conceal from Abraham what I am about to do,

“On that day I will make a horn sprout for the house of Israel, and I will open your mouth in their midst. Then they will know that I am Yahweh.”

The king answered Daniel and said, “Truly your God is a God of gods and a Lord of kings and a revealer of mysteries since you have been able to reveal this mystery.”

but in the days of the voice of the seventh angel, when he is about to sound, then the mystery of God is finished, as He proclaimed good news to His slaves, the prophets.