ANSWER:

This is not kufr but shows a person’s low iman & lack of complete belief in Allah’s divine decree. The prophet salla Allahu alaihi wa sallam has ordered us not to say: if I had done so and so, this and that wouldn’t have had happened, rather we should say: this is the divine decree of Allah and whatever He wills happens.

QUESTION: Is it wrong to dwell on an event after it has happened and then think about it and feel sad? That is, “Oh, I wish I had done that, or I wish I had done this.” Is that a sign of being a kafir? How can we stop these thoughts?