We now come to the two last items that were stated in our present mishnah as being texts that could be stated in any language. Firstly, the "testimony adjuration".
13:
On many occasions over the years we have had occasion to mention one great difference between the halakhic legal system and other legal systems with which we are familiar today. The halakhic system must assume that there is no coercive state and no organized police force. (While 'police' are mentioned in Deuteronomy 16:18 they are not really 'police' at all. As Rashi points out in his commentary on that verse they are officers of the court whose task it is to ensure that the decisions of the court, once handed down, are enforced and obeyed.) With no organized police force whose task it is to detect crime and bring the perpetrators to justice the wronged individual will have to be his own detective, his own arresting agent and his own prosecutor. The way this was done was by the aggrieved party summoning his suspect into court and producing what evidence he had as to the suspect's guilt of a crime perpetrated against him.
14:
Let us assume that Re'uven wishes to recover a debt from a recalcitrant Shim'on. In a less sophisticated society it may well have been the case that the two friends did not write out and sign a formal deed of debt and repayment: Re'uven lent his friend Shim'on 100 dinars in the full expectation that the money would be returned to him by an agreed date. When Re'uven eventually confronts Shim'on, the latter entirely denies the debt: no monies were exchanged, or the money was a gift and not a loan and so forth. The only recourse that Re'uven has is to bring Shim'on into court. But there, in court, he will need evidence that the loan was effected and under what terms it was effected. There is a 'golden rule' of evidence in halakhic jurisprudence [Gittin 48b]: "the onus of proof is on the plaintiff" - or, more literally: "the onus of proof is upon him who would extract money from someone else".
15:
Now, Re'uven was not so foolish as to lend a large sum of money to Shim'on without witnesses. Both Levi and Yehudah were present at the time that the loan was effected, but now, when Re'uven summons them to court as his witnesses against Shim'on, both Levi and Yehudah claim that they were not present and have no testimony to offer. According to the sages, the Torah [Leviticus 5:1] has already put into the hand of Re'uven a powerful tool: