A.T. Robertson Commentary Mark 1:43

"And he strictly charged him, and straightway sent him out," — Mark 1:43 (ASV)

Strictly charged (εμβριμησαμενος). Only in Mark. Luke 5:14 has παρηγγειλεν (commanded). Mark's word occurs also in 14:5 and in Mt 9:30 and Joh 11:38. See on Mt 9:30. It is a strong word for the snorting of a horse and expresses powerful emotion as Jesus stood here face to face with leprosy, itself a symbol of sin and all its train of evils. The command to report to the priests was in accord with the Mosaic regulations and the prohibition against talking about it was to allay excitement and to avoid needless opposition to Christ.