´It was narrated from Ibn 'Umar that the Prophet said:` "Whoever swears an oath and says: 'If Allah wills', then if he wishes he may go ahead, and if he wishes he may not, without having broken his oath."
Hadith ReferenceSunan an-Nasa'i / The Book of Oaths and Vows / Hadith: 3824
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح