Adam Clarke on Exodus 22:11

An oath of the Lord be between them - So solemn and awful were all appeals to God considered in those ancient times, that it was taken for granted that the man was innocent who could by an oath appeal to the omniscient God that he had not put his hand to his neighbor's goods. Since oaths have become multiplied, and since they have been administered on the most trifling occasions, their solemnity is gone, and their importance little regarded. Should the oath ever reacquire its weight and importance, it must be when administered only in cases of peculiar delicacy and difficulty, and as sparingly as in the days of Moses.