In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
When the Muslims conquered the different regions of the earth and Islam spread, the affair became as if it started from the non-Arabs, until the people of Persia and other non-Arabs became the scholars and the Imams of the mosques, and people acquired knowledge from them. It is recorded in Islamic history that many non-Arabs led the Muslims in knowledge, in issuing religious verdicts and many affairs. Take for example Abu Haneefah [may Allaah have mercy on him] who was not an Arab, and Imam Al-Bukhaari [may Allaah have mercy on him] and how his book became an upright example, and there’s none amongst the Muslims except that he (or she) knows Imam Abu Abdillaah Muhammad Bin Ismaa’eel Al-Bukhaari. And consider other examples – besides Al-Bukhaari and Abu Haneefah – amongst the Imaams of Islaam. So when Islam came with its implementation, it abolished the differences that were initiated by the people and those non-Arabs became the leaders and Imaams of the Arabs; why? Because they carried the religion, raised the banner of pure Islamic monotheism – there is no deity worthy of worship except Allaah and Muhammad is the Messenger of Allaah, and because there is no distinction in virtue between a non-Arab and an Arab, except through fear of Allaah. When the Muslims disciplined themselves with Islaam, there was no dispute between them regarding social class by way of that pre-Islamic dispute and distinction, because indeed neither did they accept leadership nor give precedence to anyone based on this; rather they accepted everyone because people are equal in this affair.
Quraish’s rulership, the Umayyad rulership and the Abbasid rulership ended; then the rulership of the Mamluks arose and thereafter the rulership of Banee Uthman – meaning in the beginning when it was upright; so the Muslims obeyed them and they became the leaders and rulers, because the Muslims saw that there was welfare for the people in doing so (based on the texts of the Qur’aan and the Sunnah, and understanding of the Sahaabah). Therefore, class differentiation and its practice was abolished from the beginning; rather no one had any reservation in implementing Islam. So, Islamic history attests to the implementation of this great principle [i.e. sound equality].
To be continued InShaaAllaah
Source: listen here: https://video.link/w/j4azb paraphrased