Nissayasutta 1.8

1.8

paññañce, bhikkhu, bhikkhu nissāya akusalaṃ pajahati kusalaṃ bhāveti, pahīnamevassa taṃ akusalaṃ hoti.

If a mendicant supported by wisdom gives up the unskillful and develops the skillful, the unskillful is actually given up by them.