nēsteia

(Translation from NRSV)

Luke

2: 37

then as a widow to the age of eighty-four. She never left the temple but worshiped there with fasting (nēsteia) and prayer night and day.

Acts

14: 23	And after they had appointed elders for them in each church, with prayer and fasting (nēsteia) they entrusted them to the Lord in whom they had come to believe.
27: 9	Since much time had been lost and sailing was now dangerous, because even the Fasting (nēsteia) had already gone by, Paul advised them,