Noun oligopistia (little faith) in the Bible

(Translation from NRSV for the New Testament with a few modifications for a more literal meaning)

Matthew

17: 20He said to them, "Because of your little faith (oligopistia). For truly I tell you, if you have faith the size of a mustard seed, you will say to this mountain, 'Move from here to there,' and it will move; and nothing will be impossible for you."