قُلْ أَيُّ شَيْءٍ أَكْبَرُ شَهَادةً قُلِ اللّهِ شَهِيدٌ بِيْنِي وَبَيْنَكُمْ وَأُوحِيَ إِلَيَّ هَذَا الْقُرْآنُ لأُنذِرَكُم بِهِ وَمَن بَلَغَ أَئِنَّكُمْ لَتَشْهَدُونَ أَنَّ مَعَ اللّهِ آلِهَةً أُخْرَى قُل لاَّ أَشْهَدُ قُلْ إِنَّمَا هُوَ إِلَهٌ وَاحِدٌ وَإِنَّنِي بَرِيءٌ مِّمَّا تُشْرِكُونَ
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سورة الأنعام
(6/19) Say thou: what thing is the greatest in testimony? Say thou: Allah is Witness between me and you, and this Qur´an hath been revealed unto me that I may thereby warn you and whomsoever it may reach. Would ye indeed testify that there is anot her god together with Allah? Say thou: I testify not. Say thou: verily He is the One God, and I am quit of that which ye associate.
Surah Al-An'am