The Legend of Al-Habaab

Al-Habaab was one of the more knowledgeable of the Sahaba. Even as a slave he's going secretly to the house of other people to teach them the Quran. He participated in all of the expeditions of the Prophet ﷺ, and he lived up until the 17th year of the Hijra. Umar had an interesting policy that everybody should get the same stipend.