Found most often in the book of Hebrews (5:6; 7:1, 3, 11, 14-15, 17, 21, 23; 8:4; 9:6; 10:11, 21), but also used in Mt. 8:4; 12:4-5; Mk. 1:44; 2:26; Lk. 1:5; 5:14; 6:4; 10:31; 17:14; Jn. 1:19; Acts 4:1; 5:24; 6:7; 14:13; Rev. 1:6; 5:10; 20:6, the Greek noun “hiereus” meant “priest.”