3 Bible Verses about Beating Oneself

but I put my body under severe discipline, and bring it into subjection, lest, after I have preached to others, I myself should be rejected.

And the publican, standing afar off, would not even lift up his eyes to heaven, but smote upon his breast, saying: God, be merciful to me a sinner.

And all the multitudes that had come together to that sight, when they saw what was done, returned, smiting their breasts.