first-moving
/ˈfəːstmuːvɪŋ/adjective
Attributive Now chiefly Philosophy. That is the initial or primary source of movement or activity; especially (in first moving cause) denoting God as the motive force of the universe; (in early use also) designating the outermost sphere of Aristotelian cosmology (now historical ).
Origin
Late Middle English (in an earlier sense). From first + moving, after post-classical Latin primum mobile.