Pope Shenouda III
Christ started His service with fasting, rejecting the devil's temptation to make Him eat to nourish his body, . The Lord Jesus Christ showed the devil that man was not a mere body but also a soul nourished by every word that proceeds from the mouth of God. He said to him:
“Man shall not live by bread alone, but by every word that proceeds from the mouth of God.” (Matt 4:4).
This was not a new spiritual principal introduced in the New Testament but an old commandment given to man in the first written law. (Dent 8:3).