﴿ قُلْ فَلِلَّهِ ٱلْحُجَّةُ ٱلْبَٰلِغَةُ ۖ فَلَوْ شَآءَ لَهَدَىٰكُمْ أَجْمَعِينَ ﴾

“Say: "[Know,] then, that the final evidence [of all truth] rests with God alone; and had He so willed, He would have guided you all aright.”

(Say) to them, O Muhammad, if you do not have an argument for your claim, then (For Allah's is the final argument) the most firm argument. (Had He willed He could indeed have guided all of you) to His religion.