I said 'O Allah's Messenger (ﷺ)! Which sin is the greatest?" He said, "To set up a rival unto Allah, though He Alone created you." I said, "What next?" He said, "To kill your son lest he should share your food with you." I further asked, "What next?" He said, "To commit illegal sexual intercourse with the wife of your neighbor." And then Allah revealed as proof of the statement of the Prophet: 'Those who invoke not with Allah any other god alongwith Allah, and kill not the same which Allah has forbidden unjustly and don't commit adultery, and whosover does this, shall get the punishment''.)…………….. (to end of verse)…' (25.68)