Abu Hurairah narrated that the Messenger of Allah ﷺ said: "The oath is based upon what will make your companion believe you". Qutaibah (one of the narrators) said: " What will make you believed by your companion"
The Prophet Muhammad ﷺ also taught us to be mindful of how we speak when making promises or commitments as this will have a lasting impact on those around us. We must always strive for truthfulness and honesty when making any kind of promise or commitment, especially when taking an oath as it is important for maintaining trust between people.