Is it ensure, insure, or assure?
c.1200, of God; c.1300, of persons, from Old French jalousie "enthusiasm, love, longing, jealousy" (12c.), from jalos (see jealous). Meaning "zeal, fervor, devotion" is late 14c.
suspicion of a wife's purity, one of the strongest passions (Num. 5:14; Prov. 6:34; Cant. 8:6); also an intense interest for another's honour or prosperity (Ps. 79:5; 1 Cor. 10:22; Zech. 1:14).