A.T. Robertson Commentary Matthew 26:5

"But they said, Not during the feast, lest a tumult arise among people." — Matthew 26:5 (ASV)

A tumult (θορυβος). They feared the uprising in behalf of Jesus and were arguing that the matter must be postponed till after the feast was over when the crowds had scattered. Then they could catch him "by craft" (δολω) as they would trap a wild beast.