Omar's behavior led to the creation of a class society. Something that did not exist at the time of the Messenger of God. Muslims were a single nation during the time of the Messenger of God. The Messenger of God did not distinguish between Arabs and non-Arabs. As he did not distinguish between black and white. As he did not distinguish between men and women. In the eyes of the Messenger of God, the best people were the most pious people. Omar gave more Bait-ul-Mal to the people who converted to Islam earlier. This was heresy. Muhammad never did that. Muhammad divided Bait-ul-Mal equally. Also, Omar gave more trophies to people who had more conquests; More war, more loot. During the time of Muhammad, war spoils were divided equally. The Prophet did not fight for domination. The Prophet won the hearts of the people.
I did not say this out of stubbornness. Although Omar himself lived a very simple life like the Messenger of God, but his actions created aristocracy after the Messenger of God. The aristocracy that diverted Muhammad's revolution from its path: (Muhammad is no more than a messenger: many Were the messenger that passed away before him. If he died or were slain, will ye then Turn back on your heels? If any did turn back on his heels, not the least harm will he do to Allah; but Allah (on the other hand) will swiftly reward those who (serve Him) with gratitude.)[Q3:144]
I did not say this out of stubbornness. Although Omar himself lived a very simple life like the Messenger of God, but his actions created aristocracy after the Messenger of God. The aristocracy that diverted Muhammad's revolution from its path: (Muhammad is no more than a messenger: many Were the messenger that passed away before him. If he died or were slain, will ye then Turn back on your heels? If any did turn back on his heels, not the least harm will he do to Allah; but Allah (on the other hand) will swiftly reward those who (serve Him) with gratitude.)[Q3:144]