Anumodana

anumodana (T. rjes su yi rang; C. suixi; J. zuiki; K. suhŭi 隨喜). Tranlsated as "rejoicing," “admiration,” etc. It is the act of taking delight in the virtuous acts of others. It is an antidote to jealousy and a means of accumulating merit for oneself.

Anumodana is one of the seven branches of practice.

The Library of Wisdom and Compassion (Vol 2) sates:

Rejoicing in your own and others’ virtue is [...] an excellent method to fill your mind with hope and joy and overcomes competition and jealousy. Reflect with joy on the virtues you and others have created in this and previous lives and at all the goodness in the world. Rejoicing in your own virtue invigorates and multiplies it so that it will increase day by day. Also admire and rejoice in the virtues of people you know and those you don’t, reflecting repeatedly on their constructive thoughts, feelings, words, and deeds. Rejoicing in the virtues and spiritual attainments of the buddhas, bodhisattvas, solitary realizers, and śrāvakas throughout all time and space creates vast merit. If you and others are of similar levels on the path, by rejoicing at their virtue you accumulate merit equal to theirs. If they are of lesser attainment, your rejoicing creates more merit than their original virtuous action. The practice of rejoicing is praised because through making a small effort, great merit is accumulated.

Sources

• Buswell, Robert E.; Lopez, Donald S. (2014), The Princeton Dictionary of Buddhism, Princeton University 
• Dalai Lama; Thubten Chodron (2018), The Foundation of Buddhist Practice, The Library of Wisdom and Compassion, Volume 2, Wisdom Publications