In Dvāpara-yuga the religious qualities of austerity, truth, mercy and charity are reduced to one half by their irreligious counterparts — dissatisfaction, untruth, violence and enmity.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तपःसत्यदयादानेष्वर्धं ह्रसति द्वापरे । हिंसातुष्ट्यनृतद्वेषैर्धर्मस्याधर्मलक्षणैः
tapaḥsatyadayādāneṣvardhaṃ hrasati dvāpare | hiṃsātuṣṭyanṛtadveṣairdharmasyādharmalakṣaṇaiḥ
SB 12.3.22