The Quran

الَّذينَ يُجادِلونَ في آياتِ اللَّهِ بِغَيرِ سُلطانٍ أَتاهُم ۖ كَبُرَ مَقتًا عِندَ اللَّهِ وَعِندَ الَّذينَ آمَنوا ۚ كَذٰلِكَ يَطبَعُ اللَّهُ عَلىٰ كُلِّ قَلبِ مُتَكَبِّرٍ جَبّارٍ

Muhammad Asad

such as would call God's messages in question without having any evidence therefor:¹ [a sin] exceedingly loathsome in the sight of God and of those who have attained to faith. It is in this way that God sets a seal on every arrogant, self-exalting heart."²

Lit., "without any authority [or "evidence"] having come to them": i.e., without having any cogent evidence that would support their "denial" of the fact of revelation. - The verb jadala primarily denotes "he argued"; followed by the particle fi ("with regard to" or "about") it has the meaning of contesting the truth of something, or "calling it in question".
Lit., "on the heart of every arrogant, self-exalting [person]". For an explanation of God's "sealing" an inveterate sinner's heart, see note 7 on 2:7.