Reference for Keritot 47:28

שור הנסקל שהוזמו עדיו כל המחזיק בו זכה בו

and he therefore renounces the ownership of his property; in our instance, however, the matter rests with him alone; as he knows that he did not abuse the animal he does not renounce his ownership of it, but rather endeavours to find witnesses [to disprove the charge].

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