Surah Al-An'am, Ayah 19
Quran 6:19 · The Cattle · Makki · Para 7 · Page 130
قُلْ اَیُّ شَیْءٍ اَكْبَرُ شَهَادَةً ؕ قُلِ اللّٰهُ ۙ۫ شَهِیْدٌۢ بَیْنِیْ وَبَیْنَكُمْ ۫ وَاُوْحِیَ اِلَیَّ هٰذَا الْقُرْاٰنُ لِاُنْذِرَكُمْ بِهٖ وَمَنْ بَلَغَ ؕ اَىِٕنَّكُمْ لَتَشْهَدُوْنَ اَنَّ مَعَ اللّٰهِ اٰلِهَةً اُخْرٰی ؕ قُلْ لَّاۤ اَشْهَدُ ۚ قُلْ اِنَّمَا هُوَ اِلٰهٌ وَّاحِدٌ وَّاِنَّنِیْ بَرِیْٓءٌ مِّمَّا تُشْرِكُوْنَ ۟ۘ
Transliteration
Qul ayyu shay-in akbaru shahadatanquli Allahu shaheedun baynee wabaynakum waoohiyailayya hatha alqur-anu li-onthirakum bihiwaman balagha a-innakum latashhadoona anna maAAa Allahi alihatanokhra qul la ashhadu qul innama huwa ilahunwahidun wa-innanee baree-on mimma tushrikoon
Saheeh International
Say, "What thing is greatest in testimony?" Say, "Allāh is witness between me and you. And this Qur’ān was revealed to me that I may warn you thereby and whomever it reaches. Do you [truly] testify that with Allāh there are other deities?" Say, "I will not testify [with you]." Say, "Indeed, He is but one God, and indeed, I am free of what you associate [with Him]."
Al-Mukhtasar fi Tafsir
Say, O Messenger, to the idolaters who deny you: Which thing is greatest and most honoured as a witness to my truthfulness? Say: Allah is the greatest and most honoured witness to my truthfulness. He is a witness between you and me. He knows what I have brought to you and how you respond. Allah has revealed this Qur’ān to me to warn you by it and to warn any human or jinn it reaches. You, O idolaters, believe that there are others worthy of worship together with Allah. Say, O Messenger: I do not bear witness to what you have acknowledged as it is false. Allah is only one God: He has no partner. I am free from all that you associate as partners with Him.
Tafsir Ibn Kathir (abridged)
Explains 6:17–6:21 together — read it on 6:17