This is in reverence to God Almighty the Creator of Heaven and Earth. Abram (Abraham) knelt down before God as recorded in Genesis 17:3. Other instances are as referenced below;
Psalm 95:6 – O come, let us worship and bow down; let us kneel before the LORD our Maker.
Isaiah 45:23 – By Myself I have sworn; truth has gone out from My mouth, a word that will not be revoked: Every knee will bow before Me, every tongue will confess allegiance.
Philippians 2:9-11 – Therefore God exalted Him to the highest place and gave Him the name above all names, that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is Lord, to the glory of God the Father
Matthew 26:39 – Going a little farther, He fell facedown and prayed, “My Father, if it is possible, let this cup pass from Me. Yet not as I will, but as You will.”
Mark 10:17 – As Jesus started on his way, a man ran up to him and fell on his knees before him. “Good teacher,” he asked, “what must I do to inherit eternal life?”
Luke 5:8 – When Simon Peter saw this, he fell at Jesus’ knees and said, “Go away from me, Lord; I am a sinful man!”
Luke 22:40-41 – And when he came to the place, he said to them, “Pray that you may not enter into temptation.” And he withdrew from them about a stone throw, and knelt down and prayed
Acts 7:60 – Then he fell on his knees and cried out, “Lord, do not hold this sin against them.” When he had said this, he fell asleep.
Revelation 4:10 -11 – the twenty-four elders fall down before the One seated on the throne, and they worship Him who lives forever and ever. They cast their crowns before the throne, saying: You are worthy, our Lord and God, to receive glory and honor and power, for You created all things; by Your will they exist, and came to be.
Revelation 19:4 – And the twenty-four elders and the four living creatures fell down and worshiped God who sits on the throne, saying: “Amen, Hallelujah!”