Yaqub and his religion (devils)

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I always hear about Yaqub. However I have only heard small details of a belief built off of him about white people being experiments and devils, and alien spaceships. I was told there are tablets that were written by him that contain this information but the only reference to this belief I can find is from Farrakhan and was wondering if someone could point me in the right direction to find out about this belief. I know this sounds ignorant but I would really like to know, the people who tell me this can never site anything as a source. So any reply would be greatly appreciated.