'Fasting' in the Bible

While they were worshipping the Lord and fasting, the Holy Spirit said, "Set apart for Me, now at once, Barnabas and Saul, for the work to which I have called them."

So, after fasting and prayer and the laying on of hands, they let them go.

And in every Church, after prayer and fasting, they selected Elders by show of hands, and commended them to the Lord on whom their faith rested.