Psalms 133:2
It is like the precious ointment upon the head, that ran down upon the beard, even Aaron’s beard: that went down to the skirts of his garments; It is like the precious ointment upon the head, that ran down upon the beard, even Aaron’s beard: that went down to the skirts of his garments;
The precious ointment is the oil of grace within the heart. That grace takes away the harsh contact that would otherwise cause friction among believers. Filled with it, they are able to work together quietly and well, united in action without jarring or strife.