“I discipline my body and bring it into subjection”

But I discipline my body and bring it into subjection, lest, when I have preached to others, I myself should become disqualified.
1 Corinthians 9:27

“the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, gentleness (meekness), self-control.”

But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, 23 [g] gentleness (meekness), self-control. Against such there is no law.
Galatians 5:22-23

“He had fasted forty days and forty nights”

And when He had fasted forty days and forty nights, afterward He was hungry.
Matthew 4:2

“when you fast, anoint your head and wash your face, so that you do not appear to men to be fasting, but to your Father who is in the secret place;

and your Father who sees in secret will reward you openly.”

Fasting to Be Seen Only by God
“Moreover, when you fast, do not be like the hypocrites, with a sad countenance. For they disfigure their faces that they may appear to men to be fasting. Assuredly, I say to you, they have their reward. 17 But you, when you fast, anoint your head and wash your face, 18 so that you do not appear to men to be fasting, but to your Father who is in the secret place; and your Father who sees in secret will reward you openly.
Matthew 6.16-18

“‘but Your disciples do not fast?’”

“But the days will come when the bridegroom will be taken away from them, and then they will fast.”

Jesus Is Questioned About Fasting
14 Then the disciples of John came to Him, saying, “Why do we and the Pharisees fast often, but Your disciples do not fast?”
15 And Jesus said to them, “Can the friends of the bridegroom mourn as long as the bridegroom is with them? But the days will come when the bridegroom will be taken away from them, and then they will fast. 16 No one puts a piece of unshrunk cloth on an old garment; for the patch pulls away from the garment, and the tear is made worse. 17 Nor do they put new wine into old wineskins, or else the wineskins [f] break (burst), the wine is spilled, and the wineskins are ruined. But they put new wine into new wineskins, and both are preserved.”
Matthew 9.14-17

“So Jesus said to them, “Because of your unbelief (little faith); for assuredly, I say to you, if you have faith as 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.”

“However, this kind does not go out except by prayer and fasting.”

19 Then the disciples came to Jesus privately and said, “Why could we not cast it out?”
20 So Jesus said to them, “Because of your [e] unbelief (little faith); for assuredly, I say to you, if you have faith as 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. 21 However, this kind does not go out except by prayer and fasting.”
Matthew 17.19-21

“‘Four days ago I was fasting until this hour'”

“‘Cornelius, your prayer has been heard, and your alms (charitable gifts) are remembered in the sight of God.”

So Cornelius said, “Four days ago I was fasting until this hour; and at the ninth hour I prayed in my house, and behold, a man stood before me in bright clothing, 31 and said,‘Cornelius, your prayer has been heard, and your [j] alms (charitable gifts) are remembered in the sight of God.
Acts 10.30-31