Adam Clarke on Luke 12:58

When thou goest with thine adversary - This and the next verse are a part of our Lord's sermon upon the mount. See them explained Mat 5:25, Mat 5:26 (note). St. Luke is very particular in collecting and relating every word and action of our blessed Lord, but seldom gives them in the order of time in which they were spoken or done. See the Preface to this Gospel.

Give diligence - Δος εργασιαν, Give labor, do every thing in thy power to get free before a suit commences.

The officer - Πρακτωρ properly signifies such an officer as was appointed to levy the fines imposed by the law for a violation of any of its precepts. See Kypke.