The Criterion
قُلْ أَنزَلَهُ ٱلَّذِى يَعْلَمُ ٱلسِّرَّ فِى ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ ۚ إِنَّهُۥ كَانَ غَفُورًا رَّحِيمًا
Say, [O Muhammad], "It has been revealed by He who knows [every] secret within the heavens and the earth. Indeed, He is ever Forgiving and Merciful."
Nearby ayahs help place verse 25:6 in sequence and meaning.
وَقَالَ ٱلَّذِينَ كَفَرُوٓا۟ إِنْ هَـٰذَآ إِلَّآ إِفْكٌ ٱفْتَرَىٰهُ وَأَعَانَهُۥ عَلَيْهِ قَوْمٌ ءَاخَرُونَ ۖ فَقَدْ جَآءُو ظُلْمًا وَزُورًا
And those who disbelieve say, "This [Qur'an] is not except a falsehood he invented, and another people assisted him in it." But they have committed an injustice and a lie.
وَقَالُوٓا۟ أَسَـٰطِيرُ ٱلْأَوَّلِينَ ٱكْتَتَبَهَا فَهِىَ تُمْلَىٰ عَلَيْهِ بُكْرَةً وَأَصِيلًا
And they say, "Legends of the former peoples which he has written down, and they are dictated to him morning and afternoon."
وَقَالُوا۟ مَالِ هَـٰذَا ٱلرَّسُولِ يَأْكُلُ ٱلطَّعَامَ وَيَمْشِى فِى ٱلْأَسْوَاقِ ۙ لَوْلَآ أُنزِلَ إِلَيْهِ مَلَكٌ فَيَكُونَ مَعَهُۥ نَذِيرًا
And they say, "What is this messenger that eats food and walks in the markets? Why was there not sent down to him an angel so he would be with him a warner?
أَوْ يُلْقَىٰٓ إِلَيْهِ كَنزٌ أَوْ تَكُونُ لَهُۥ جَنَّةٌ يَأْكُلُ مِنْهَا ۚ وَقَالَ ٱلظَّـٰلِمُونَ إِن تَتَّبِعُونَ إِلَّا رَجُلًا مَّسْحُورًا
Or [why is not] a treasure presented to him [from heaven], or does he [not] have a garden from which he eats?" And the wrongdoers say, "You follow not but a man affected by magic."