Matthew 17:19-20

19Then the disciples came to Jesus privately and said, “Why couldn't we drive it out?”

20He told them, “Because of your lack of faith.
Other mss. read your little faith
For truly I tell you, if you have faith like a grain of mustard seed, you can say to this mountain, ‘Move from here to there,’ and it will move, and nothing will be impossible for you.

Mark 16:18

18they will pick up snakes in their hands;
Other mss. lack in their hands
even if they drink any deadly poison it will not hurt them; and they will place their hands on the sick, and they will recover.”Luke 10:19; Acts 5:15-16; 9:17; James 5:14-15

1 Corinthians 13:2

2If I have the gift of prophecy and can understand all secrets and every form of knowledge, and if I have absolute faith so as to move mountains but have no love, I am nothing.Matt 7:22; 17:20; Mark 11:23; Luke 17:6; 1Cor 12:8-10, 28; 14:1

2 Corinthians 4:13

13Now since we have the same spirit of faith in keeping with what is written—“I believed, and so I spoke”
Ps 116:10
—we also believe, and so we speak.Ps 116:10; Rom 1:12; 2Pet 1:1

James 5:14

14Is anyone of you sick? He should call for the elders of the church, and they should pray for him and anoint him with oil in the name of the Lord.Mark 6:13; 16:18
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