Adam Clarke on Ezekiel 20:37

I will cause you to pass under the rod - This alludes to the custom of tithing the sheep. I take it from the rabbins. The sheep were all penned; and the shepherd stood at the door of the fold, where only one sheep could come out at once. He had in his hand a rod dipped in vermillion; and as they came out, he counted one, two, three, four, five, six, seven, eight, nine; and as the tenth came out, he marked it with the rod, and said, "This is the tenth;" and that was set apart for the Lord.

I wilt bring you into the bond of the covenant - You shall be placed under the same obligations as before, and acknowledge your selves bound; ye shall feel your obligation, and live according to its nature.