The Prophets
قَالَ بَل رَّبُّكُمْ رَبُّ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ ٱلَّذِى فَطَرَهُنَّ وَأَنَا۠ عَلَىٰ ذَٰلِكُم مِّنَ ٱلشَّـٰهِدِينَ
He said, "[No], rather, your Lord is the Lord of the heavens and the earth who created them, and I, to that, am of those who testify.
Nearby ayahs help place verse 21:56 in sequence and meaning.
قَالَ لَقَدْ كُنتُمْ أَنتُمْ وَءَابَآؤُكُمْ فِى ضَلَـٰلٍ مُّبِينٍ
He said, "You were certainly, you and your fathers, in manifest error."
قَالُوٓا۟ أَجِئْتَنَا بِٱلْحَقِّ أَمْ أَنتَ مِنَ ٱللَّـٰعِبِينَ
They said, "Have you come to us with truth, or are you of those who jest?"
وَتَٱللَّهِ لَأَكِيدَنَّ أَصْنَـٰمَكُم بَعْدَ أَن تُوَلُّوا۟ مُدْبِرِينَ
And [I swear] by Allah, I will surely plan against your idols after you have turned and gone away."
فَجَعَلَهُمْ جُذَٰذًا إِلَّا كَبِيرًا لَّهُمْ لَعَلَّهُمْ إِلَيْهِ يَرْجِعُونَ
So he made them into fragments, except a large one among them, that they might return to it [and question].