Because he calls himself a black Israelite, and Ab-Soul had the Kabbalistic Tree of Life as his album cover on Control System
and Mac Miller is a jew, who also studied the Kabbalistic tree of life. both Mac Miller & Ab-Soul talk about the divine feminine and question if God is a female on their latest albums. Mac Miller's album was called "Divine Feminine".. These are concepts found in Kabbalistic/Thelemite texts
Ab-Soul's album is called "Do What Thou Wilt" which is a phrase that was coined by Aleister Crowley.. Aleister Crowley started Thelema and he started his own sect of the OTO (Ordo Templi Orientis)
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it's not a foreign concept but given that Mac Miller is jewish, and given Ab-Soul's past of incorporating Kabbalistic artwork & Kabbalah/Thelema inspired tracks we can deduce that they've been studying it. And they've been studying it for years
Ab-Soul said his favorite rapper was Jay-Z and by now we ALL know Jay-Z is a Thelemite/Aleister Crowley dickrider