The Messenger of Allah ﷺ said, "Your oath is binding according to what your companion accepts as true from you."
حدثنا عمرو بن رافع حدثنا هشيم أنبأنا عبد الله بن أبي صالح عن أبيه
قال رسول الله ﷺ يمينك على ما يصدقك به صاحبك
No references are available.
Reported by Muslim in the previous chapter of oaths, no. 1653, from the hadith of Hushaym, in the same way.