Skandapurana 5.51.45

5.51.45

yaḥ svaṃ vākyaṃ pratijñāya na karoti yathoditam ..
kiṃ tena na kṛtaṃ pāpaṃ caureṇākṛta buddhinā .. 45 ..

He who, having made a pledge with his own word, does not do as declared, / what sin has not been committed by that thief of evil intent? 45.”