15 For now, when you have returned home, you will be continually the prey of conscience, while reasoning thus with yourself; “Was it to no purpose, then, that I put him upon his oath? Was he not really perjured? Have I not become the cause of the sin?” But if you dost not put him upon his oath, you will receive much consolation on returning home, rendering thanks to God, and saying, “Blessed be God, that I restrained myself, and did not compel him to swear vainly, and to no purpose.
Away with gold! Perish the money!” for that which specially gives us assurance is, that we did not transgress the law, nor compel another to do it. Consider, for Whose sake thou did not put any one on his oath; and this will suffice you for refreshment and consolation. Often, indeed, when a fight takes place, we bear being insulted with fortitude, and we say to the insulter, “What shall I do with you? Such an one hinders me, who is your patron; he keeps back my hands.” And this is sufficient to console us.
So when you are about to put any one on his oath, restrain yourself; and stop; and say to him who is about to swear, “What shall I do with you? God has forbidden me to put any one on oath. He now holds me back.” This suffices both for the honour of the Lawgiver, and for your safety, and for keeping him in fear who is ready to swear. For when he sees that we are thus afraid to put others on oath, much more will he himself be afraid to swear rashly. Would you say thus, your return to your own home would be with much fullness of assurance. Hear God, therefore, in His Commandments, that He may Himself hear you in your prayers! This word shall be written in heaven, and shall stand by you on the Day of Judgment, and shall discharge many sins.
Source: Homilies on the Statues (New Advent)