Dhammapada verses 120 and 121

120. It may be ill with the doer of good as long as the good ripens not. But when it does ripen, then the doer of good sees (the pleasant results of) his good deeds.

121. Think not lightly of evil, saying, “It will not come to me.” Drop by drop is the water pot filled. Likewise, the fool, gathering it little by little, fills himself with evil.

– Dhammapada IX – Papavagga: Evil 120 and 121