1 Samuel 6:3

If, &c. The lords were already determined to send back the ark. But the priests knew that some still would not believe that it was the cause of their affliction. To convince all, they try an experiment, which would decide the matter; and in case the ark went back, some suitable presents must accompany it, as a propitiation (Haydock) for the sin which they would not (Menochius) then doubt had been incurred. (Haydock) --- Though God stands in need of nothing, all must acknowledge their dependence on him. The pagans always made some present, when they appeared before their idols or monarchs, and God requires the like testimony of submission, Exodus xxiii. 15.