I heard the Messenger of Allah ﷺ as saying: One who wrongfully takes an extra tax (sahib maks) will not enter Paradise. (Using translation from Abū Dāʾūd 2937)   

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «لَا يَدْخُلُ الْجَنَّةَ صَاحِبُ مَكْسٍ» قَالَ أَبُو مُحَمَّد «يَعْنِي عَشَّارًا»