World Wide Study Bible
a Bible passage
7, 8. when the angel … was departed, he called—immediately doing as directed, and thereby showing the simplicity of his faith.
a devout soldier of them that waited on him continually—of the "soldiers under him," such as the centurion at Capernaum had (Mt 8:9). Who this "devout soldier" was, can only be matter of conjecture. Da Costa [Four Witnesses] gives a number of ingenious reasons for thinking that, having attached himself henceforth to Peter—whose influence in the composition of the second Gospel is attested by the earliest tradition, and is stamped on that Gospel itself—he is no other than the Evangelist Mark.