1 Corinthians 2:7
But we impart a secret and hidden wisdom of God, h which God decreed before the ages for our glory.
English Standard Version (ESV) The Holy Bible, English Standard Version Copyright © 2001 by Crossway Bibles, a division of Good News Publishers.
Romans 16:25 - 26
Now to him who is able to strengthen you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery that was kept secret for long ages
Which was not made known to the sons of men in other generations as it has now been revealed to his holy apostles and prophets by the Spirit.
And to bring to light for everyone what is the plan of the mystery hidden for ages in God who created all things.
The mystery hidden for ages and generations but now revealed to his saints.
2 Timothy 1:9
Who saved us and called us to a holy calling, not because of our works but because of his own purpose and grace, which he gave us in Christ Jesus before the ages began.