1. "Al-Kharaj" is that tax which is charged on the produce yielded by land which is in the possession of non-Muslims in a Muslim State, while the revenue that is recovered from the Muslims on the lands held by them is called "Al-Ushr". "Jizyah" is that annual fee which is charged from the non-Muslims for the safety and security provided to their life, property and honour by a Muslim State. Muslims pay Zakat and non-Muslims pay Jizyah.
2. "Adhab" torment is that particular punishment which Allah will inflict upon the inhabitants of Hell. If anyone gives a similar punishment to anybody in this world, he will be punished by Allah in the Hereafter for it, because He does not like anyone to do so. To make someone stand in a sizzling hot day and pour oil over his head is one type of tormenting people. For this reason, Hisham bin Hakim (May Allah be pleased with them) mentioned this Hadith to the Governor to warn him and make him abolish the punishment.
3. We also learn from this Hadith that it is incumbent on every Muslim to enjoin good on people and forbid them from doing evil.
4. Tyrants should be warned against their tyrannies so that they abstain from them.