Al-Sha'bi said that Abd al-Rahman bin Udhaynah wrote to Qadi Shurayh about some people of al-Azd who had brought a claim against some people of Banu Asad: whenever these came in the morning with witnesses, those came in the evening with more than them. So he (Shurayh) wrote back to him: I have nothing to do with witnesses cancelling one another out or outnumbering one another. The animal remains with those in whose possession it is, when they have produced witnesses.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الدعوى والبينات / 21227