al-Walid bin Muslim al-Quraishi الوليد بن مسلم القرشي · The Chapters on Expiation

"The swearing of the Messenger of Allah (ﷺ) when he took an oath and I bear witness before Allah was: 'By the One in Whose Hand is my soul."'

"The Prophet (ﷺ) saw an old man walking between his two sons, and he said: What is the matter with him?' His sons said: 'A vow, O Messenger of Allah.' He said: 'Let this old man ride, for Allah has no need of you or your vow."'