Dhammapada 2.3.p10

2.3.p10

‘‘Doso rajo na ca pana reṇu vuccati,
Dosassetaṃ adhivacanaṃ rajoti;
Etaṃ rajaṃ vippajahitva bhikkhavo,
Viharanti te vigatarajassa sāsane.

Hatred, not dirt, is properly called impurity; to hatred is correctly applied the term “impurity.”
Monks should rid themselves of this form of impurity and live faithful to the religion of him who is devoid of hatred.