That the Messenger of Allah (ﷺ) said: "Whoever swears about an oath and says: 'If Allah wills (Insha Allah), then there is no breaking of the oath against him."
Reference: Jami` at-Tirmidhi 1531 In-book : Book 20, Hadith 9 English translation : Vol. 3, Book 18, Hadith 1531
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