My knees are weak from fasting,

Psalm 69:10
I wept and fasted, but it brought me reproach.

Psalm 35:13
Yet when they were ill, I put on sackcloth; I humbled myself with fasting, but my prayers returned unanswered.

Daniel 10:8
So I was left alone, gazing at this great vision. No strength remained in me; my face grew deathly pale, and I was powerless.

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and my body grows lean and gaunt.

Psalm 102:4-5
My heart is afflicted, and withered like grass; I even forget to eat my bread. / Through my loud groaning my skin hangs on my bones.

Job 19:20
My skin and flesh cling to my bones; I have escaped by the skin of my teeth.

Lamentations 4:8
But now their appearance is blacker than soot; they are not recognized in the streets. Their skin has shriveled on their bones; it has become as dry as a stick.

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Isaiah 58:5
Is this the fast I have chosen: a day for a man to deny himself, to bow his head like a reed, and to spread out sackcloth and ashes? Will you call this a fast and a day acceptable to the LORD?

Job 16:8
You have bound me, and it has become a witness; my frailty rises up and testifies against me.

Daniel 10:3
I ate no rich food, no meat or wine entered my mouth, and I did not anoint myself with oil until the three weeks were completed.

Matthew 4:2
After fasting forty days and forty nights, He was hungry.

2 Corinthians 11:27
in labor and toil and often without sleep, in hunger and thirst and often without food, in cold and exposure.

Matthew 6:16-18
When you fast, do not be somber like the hypocrites, for they disfigure their faces to show men they are fasting. Truly I tell you, they already have their full reward. / But when you fast, anoint your head and wash your face, / so that your fasting will not be obvious to men, but only to your Father, who is unseen. And your Father, who sees what is done in secret, will reward you.

1 Kings 19:8
So he got up and ate and drank. And strengthened by that food, he walked forty days and forty nights until he reached Horeb, the mountain of God.

Nehemiah 1:4
When I heard these words, I sat down and wept. I mourned for days, fasting and praying before the God of heaven.

Ezra 10:6
Then Ezra withdrew from before the house of God and walked to the chamber of Jehohanan son of Eliashib. And while he stayed there, he ate no food and drank no water, because he was mourning over the unfaithfulness of the exiles.

Acts 13:2-3
While they were worshiping the Lord and fasting, the Holy Spirit said, “Set apart for Me Barnabas and Saul for the work to which I have called them.” / And after they had fasted and prayed, they laid their hands on them and sent them off.