Mahāgopālakasutta

mn33:19.1 And how does a mendicant pick out flies’ eggs?

mn33:19.2 It’s when a mendicant doesn’t tolerate a sensual, malicious, or cruel thought that has arisen. They don’t tolerate any bad, unskillful qualities that have arisen, but give them up, dispel them, eliminate them, and obliterate them.

mn33:19.3 That’s how a mendicant picks out flies’ eggs.