Hadith #253
English (English)If any harm befalls you, don’t say ‘If I had done so, then so and so would have happened.’ Instead say: ‘It was destined so by Allah to us and He did as He willed’, because the word ‘if’ commences Satan’s affairs.
Reference: صحيح مسلم، كتاب القدر، باب في الأمر بالقوة وترك العجز، الحدیث 2664