What Does “Conversion” Mean in the Bible?
To turn to God with all your heart and change your life. It is what Jesus asks from the very beginning.
Where it appears in the Bible
Mark 1:15
What the Bible says
Mark 1:15
And saying: The time is accomplished, and the kingdom of God is at hand: repent, and believe the gospel.
Douay-Rheims Bible (Challoner revision), public domain.
Source: Catechism 1430-1431; Mark 1:15