The Prophet ﷺ permitted a verdict based on the testimony of one witness together with the oath of the claimant.
حدثنا أبو بكر بن أبي شيبة حدثنا يزيد بن هارون أنبأنا جويرية بن أسماء حدثنا عبد الله بن يزيد مولى المنبعث عن رجل من أهل مصر
أن النبي ﷺ أجاز شهادة الرجل ويمين الطالب
No references are available.
Sourcing, its chain of transmission is daif. Tabarani recorded it: 7/166, no. 6717, from the hadith of Juwayria bin Asma (in the printed original it appears as Ismail, which is an error) with this wording, and Busiri judged it daif due to the unknown status of the one who transmitted it from him. The essential content of the hadith has a sahih corroborating narration mentioned just before it, which makes this unknown narration unnecessary.