The Quran

وَلا أَقولُ لَكُم عِندي خَزائِنُ اللَّهِ وَلا أَعلَمُ الغَيبَ وَلا أَقولُ إِنّي مَلَكٌ وَلا أَقولُ لِلَّذينَ تَزدَري أَعيُنُكُم لَن يُؤتِيَهُمُ اللَّهُ خَيرًا ۖ اللَّهُ أَعلَمُ بِما في أَنفُسِهِم ۖ إِنّي إِذًا لَمِنَ الظّالِمينَ

Muhammad Asad

"And I do not say unto you, 'God's treasures are with me'; nor [do I say], 'I know the reality which is beyond the reach of human perception'; nor do I say, 'Behold, I am an angel';¹ nor do I say of those whom your eyes hold in contempt,² 'Never will God grant them any good'- for God is fully aware of what is in their hearts.³ [Were I to speak thus,] verily, I would indeed be among the evildoers."

See 6 :50 and 7 : 188.
I.e., the poor and "abject" followers of Noah spoken of in verse 27 (see also note 47 above).
Lit., "all that is within themselves".