“When Christ “hungered,” as it is written, then the devil made his move to tempt him; for he was not wholly amazed at the fact of his fasting for forty days, since he knew that Elijah had fasted for the same length of time.  For this reason he took courage to attack him, thinking him to be a person of this kind, and not God.”

(Theodore of Mopsuestia, comments on Matthew 4)