Mishkat al-Masabih #3290

Ibn ‘Umar reported God’s Messenger as stating that if anyone says when swearing an oath, “If God will”, he is not held accountable if he breaks it. Tirmidhi, Abu Dawud, Nasa’i, Ibn Majah and Darimi transmitted it, but Tirmidhi mentioned a number who traced it no farther back than Ibn ‘Umar.