The defendent should swear on oath
باب الْيَمِينِ عَلَى الْمُدَّعَى عَلَيْهِ
Sunan Abu Dawood, Book of The Office of the Judge (Kitab Al-Aqdiyah)(view book)
Sunan Abu Dawood 3619
Ibn Abi Mulaikah said:
Ibn ‘Abbas wrote to me that the Messenger of Allah ﷺhad defendant should take an oath.
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ الْقَعْنَبِيُّ، حَدَّثَنَا نَافِعُ بْنُ عُمَرَ، عَنِ ابْنِ أَبِي مُلَيْكَةَ، قَالَ كَتَبَ إِلَىَّ ابْنُ عَبَّاسٍ أَنَّ رَسُولَ اللَّهِ ﷺ قَضَى بِالْيَمِينِ عَلَى الْمُدَّعَى عَلَيْهِ .
Classification
Sahih (Authentic) [Al-Albani]