Quran 6:149 — Livestock (Al-An'am)

Say, "GOD possesses the most powerful argument; if He wills He can guide all of you."

[6:148] The idol worshipers say, "Had GOD willed, we would not practice idolatry, nor would our parents, nor would we prohibit anything." Thus did those before them disbelieve, until they incurred our retribution. Say, "Do you have any proven knowledge that you can show us? You follow nothing but conjecture; you only guess."

[6:150] Say, "Bring your witnesses who would testify that GOD has prohibited this or that." If they testify, do not testify with them. Nor shall you follow the opinions of those who reject our revelations, and those who disbelieve in the Hereafter, and those who stray away from their Lord.