Where does “حكم مؤبد” come from?

حكم مؤبد (Arabic) comes from Persian موبد, from Middle Persian mgwpt', from Proto-Iranian magupati-.

Ancestry of “حكم مؤبد”, step by step

حكم مؤبد traces back through two separate lines of ancestry.

via Persian موبد

StepLanguageWordMeaning
1Persianموبدmobad, a Zoroastrian priest
2Middle Persianmgwpt'—
3Proto-Iranianmagupati-—

via Arabic حُكْم

StepLanguageWordMeaning
1Arabicحُكْم—
Every word from Proto-Iranian magupati- →Every word from Middle Persian mgwpt' →Every word from Persian موبد →