In NT appears in principle only. In OT, primarily in poetic literature. The way you practice is the way you play the game. You cannot play better than you practice. If you cheat in practice, you will cheat in the game.
Integrity is essential to winning.
Cannot get integrity after formal education is completed, when you get out in life. Integrity starts early, even a child is known by actions. If you cheat young, you will cheat old. This is important. Consistency, effort, come early, work harder, stay later.