Bhagavad Gītā Chapter Four verse 22

yadṛcchālābhasaṃtuṣṭo dvandvātīto vimatsaraḥ |
samaḥ siddhāv asiddhau ca kṛtvā ’pi na nibadhyate ||

dvaṃdva - pair of oppositessiddhi - accomplishment, performance, fulfilment, attainment, successmatsara - selfishness; envy, jealousy; hostility

Commentaries and Reflections

Commentary by TKV Desikachar:

Matsara or Jealousy –
“To find fault in others.”