1. This covenant will distinguish men, and separate the precious from the vile. In the twentieth chapter of Ezekiel, the Lord promiseth His people, after this manner, "I will cause you to pass under the rod, and I will bring you into the bond of the covenant." The phrase of causing to pass under the rod, is an allusion to shepherds, or the keepers of cattle, who when they would take special notice of their sheep or cattle, either in their number to tithe them, or in their goodness to try them, they brought them into a fold, or some other inclosed place, when letting them pass out at a narrow door, one by one, they held a rod over them, to count or consider more distinctly of them. This action was called a "passing of them under the rod," as Moses teaches us, "And concerning the tithe of the herd, or of the flock, even of whatsoever passeth under the rod, the tenth shall be holy unto the Lord." The learned Junius expounds that text in Ezekiel by this in Leviticus, giving the sense thus, "As if the Lord had said, I will prove and try the whole people of Israel, as a shepherd doeth his flock, that I may take the good and sound into the fold of My covenant, and cast out the wicked and unsound." Which interpretation is not only favoured, but fully approved, in the words immediately following, "I will bring you into the bond of the covenant, and I will purge out from among you the rebels, and them that transgress against Me." A covenant is to a nation, as a fan to the floor, which purges away the chaff and purifies the wheat. It is like the furnace to the metal, which takes away the dross and shews you a refined lump. It is a Shibboleth, to distinguish Ephraimites from Gileadites. And who knows not how great an advantage it is for the successful carrying on of any honourable design, to know friends from enemies, and the faithful from false brethren? Some have thought it unpolitical to set-a-foot this covenant, lest it should discover more enemies than friends, and so holding out to the view more than otherwise can be seen, the weakness of a party may render them, not only more obnoxious, but more inconsiderable.