A monk must keep to his own pasture ground, his own native beat (pettikavisaya) - viz., the four satipatthānas. Objects, sounds, etc., are passion fraught, inciting to lust. S.v.146f.
The introduction of the sutta contains the Sakunagghi Jātaka (q.v.). The name given in the uddāna of the Samyutta is the Sakunagghi Sutta.