The separation of the tribes
Our long marches across the desert
Being Yacub's kids
For instincts born in caves of ice
It sounds as though he is saying “Yakub”. Yakub is the arabic version of Jacob in the bible.
Those of the Nation Of Islam believe that Yacub was an intelligent scientist that discovered that white people could come from black people.
It is said that, in time (after white people were created), they were marched through the deserts and placed in the caves of Europe where they resorted to primitive behavior. (caveman)
Many rappers are Muslim and/or familiar with Nation Of Islam traditions (Lupe Fiasco, Wu-Tang Clan, Busta Rhymes, A Tribe Called Quest, Snoop Dogg, and many more), so it is no surprise that Common’s father referred to it on the album.
Common even references “supreme mathematics” (another ideology derived from the Nation of Islam) on “Sweet”:
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