Tafsir of Ad-Dukhan 44:19

وأن ﻻ تعلوا على الله

And exalt not yourselves against Allah. means, `and do not be too arrogant to follow His signs. Accept His proof and believe in His evidence.' This is like the Ayah:

إن الذين يستكبرون عن عبادتى سيدخلون جهنم دخرين

Verily, those who scorn My worship they will surely enter Hell in humiliation! (40:60)

إني آتيكم بسلطان مبين

Truly, I have come to you with a manifest authority. means, with clear and obvious proof. This refers to the clear signs and definitive evidence with which Allah sent him

وإني عذت بربي وربكم أن ترجمون