Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:20662

[Machine] We were informed by Abu Abdullah al-Hafiz and Abu Zakaria among others, who narrated from Abu Abbas Muhammad bin Ya'qub, who reported from Rabee'ah bin Sulaiman, who reported from Shafi'i, who reported from Abdul Aziz bin Muhammad bin Abi 'Ubaid al-Darawardi, who narrated from Rabee'ah bin Abi 'Abdul Rahman, who narrated from Sa'id bin Amr bin Shurahbeel bin Sa'id bin 'Ubadah, who narrated from his father, who narrated from his grandfather, who said, "We found in the books of Sa'id that the Messenger of Allah ﷺ ruled by oath with the witness." Ash-Shafi'i, may Allah have mercy on him, said and Abdul Aziz bin Al-Muttalib mentioned from Sa'id bin Amr, from his father, who said, "We found in the books of Sa'id bin 'Ubaidah that Sa'id bin 'Ubaidah testified that the Messenger of Allah ﷺ commanded Amr bin Hazm to rule by oath with a witness."  

البيهقي:٢٠٦٦٢

أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو زَكَرِيَّا فِي آخَرِينَ قَالُوا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ أنبأ الرَّبِيعُ بْنُ سُلَيْمَانَ أنبأ الشَّافِعِيُّ أنبأ عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدِ بْنِ أَبِي عُبَيْدٍ الدَّرَاوَرْدِيُّ عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ عَنْ سَعِيدِ بْنِ عَمْرِو بْنِ شُرَحْبِيلَ بْنِ سَعِيدِ بْنِ سَعْدِ بْنِ عُبَادَةَ عَنْ أَبِيهِ عَنْ جَدِّهِ قَالَ وَجَدْنَا فِي كُتُبِ سَعْدٍ أَنَّ رَسُولَ اللهِ ﷺ قَضَى بِالْيَمِينِ مَعَ الشَّاهِدِ قَالَ الشَّافِعِيُّ رَحِمَهُ اللهُ وَذَكَرَ عَبْدُ الْعَزِيزِ بْنُ الْمُطَّلِبِ عَنْ سَعِيدِ بْنِ عَمْرٍو عَنْ أَبِيهِ قَالَ وَجَدْنَا فِي كُتُبِ سَعْدِ بْنِ عُبَادَةَ يَشْهَدُ سَعْدُ بْنُ عُبَادَةَ أَنَّ رَسُولَ اللهِ ﷺ أَمَرَ عَمْرَو بْنَ حَزْمٍ أَنْ يَقْضِيَ بِالْيَمِينِ مَعَ الشَّاهِدِ