Acts 13:1-3, 14:21-28 New Revised Standard Version Updated Edition

13 Now in the church at Antioch there were prophets and teachers: Barnabas, Simeon who was called Niger, Lucius of Cyrene, Manaen a childhood friend of Herod the ruler,[a] and Saul. 2 While they were worshiping the Lord and fasting, the Holy Spirit said, “Set apart for me Barnabas and Saul for the work to which I have called them.” 3 Then after fasting and praying they laid their hands on them and sent them off.

21 After they had proclaimed the good news to that city and had made many disciples, they returned to Lystra, then on to Iconium and Antioch. 22 There they strengthened the souls of the disciples and encouraged them to continue in the faith, saying, “It is through many persecutions that we must enter the kingdom of God.” 23 And after they had appointed elders for them in each church, with prayer and fasting they entrusted them to the Lord in whom they had come to believe.

Matthew 6:16-18 New Revised Standard Version Updated Edition

16 “And whenever you fast, do not look somber, like the hypocrites, for they mark their faces to show others that they are fasting. Truly I tell you, they have received their reward. 17 But when you fast, put oil on your head and wash your face, 18 so that your fasting may be seen not by others but by your Father who is in secret, and your Father who sees in secret will reward you.