2 Peter 2:21

"For it would have been better for them never to have known the way of righteousness than after knowing it to turn back from the holy commandment delivered to them."
Galatians 4:9 ESV
"But now that you have come to know God, or rather to be known by God, how can you turn back again to the weak and worthless elementary principles of the world, whose slaves you want to be once more?"