Pope Shenouda III
The Apostles also fasted
 
       As    Christ fasted in the New Testament,  so did the Apostles who fulfilled the Lord’s commandment when He said:    “When the bridegroom will be taken away from them, … then they  will  fast.” (Matt 9:15). Thus, the apostle’s fast is the oldest and  first  fast practiced by the Christian Church.
  When the   Apostle Peter  was  fasting and  became so hungry that he longed to eat (Acts 10:10)  the vision about the  acceptance of gentile nations appeared to him. It  was declared to him  during his fast about the acceptance of these  nations.
  In his service to God, the  Apostle St. Paul said: “In labours, in sleeplessness, in  fastings;” (2 Cor 6:5), and  elsewhere “In fastings often” (2 Cor 11:27). It was  also said that he and  Barnabas fasted together (Acts 14:23)