It is an ill deed which brings remorse

Na taṃ kammaṃ kataṃ sādhu, yaṃ katvā anutappati;

Yassa assumukho rodaṃ, vipākaṃ paṭisevati.

It is an ill deed which brings remorse, 

and whose fruit is reaped in sorrow.

Dhammapada, 67.