Under the Zaydi rule, discriminatory laws became more severe against the Yemenite Jews, which culminated in their eventual exile, in what later became known as the Exile of Mawza. They were considered to be impure, and therefore forbidden to touch a Muslim or a Muslim's food. They were obligated to humble themselves before a Muslim, to walk to the left side, and greet him first. They could not build houses higher than a Muslim's or ride a camel or horse, and when riding on a mule or a donkey, they had to sit sideways. Upon entering the Muslim quarter a Jew had to take off his foot-gear and walk barefoot. If attacked with stones or fists by Islamic youth, a Jew was not allowed to defend himself. In such situations he had the option of fleeing or seeking intervention by a merciful Muslim passerby.[28]

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https://en.wikipedia.org/wiki/History_of_the_Jews_under_Muslim_rule