Quran 6:149 from Surah Al-An'aam on Divine Marvels.
قُلۡ فَلِلَّهِ ٱلۡحُجَّةُ ٱلۡبَٰلِغَةُۖ فَلَوۡ شَآءَ لَهَدَىٰكُمۡ أَجۡمَعِينَ
English translation: Say With Allah (is) the argument the conclusive And if He (had) willed surely He (would) have guided you all
Transliteration: qul falillahi al-hujatu al-balighatu falaw shaa lahadakum ajma'ina