Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/23/39

कृतकर्मक्षयो नास्ति कल्पकोटिशतैरपि ।। अवश्यमेव भोक्तव्यं कृतं कर्म शुभाशुभम् ।। ३९ ।।

sanskrit

An action once performed is never wasted even in hundreds of crores of Kalpas. Good or bad, one must of necessity enjoy the fruit of one’s action,

english translation

kRtakarmakSayo nAsti kalpakoTizatairapi || avazyameva bhoktavyaM kRtaM karma zubhAzubham || 39 ||

hk transliteration by Sanscript