Psalm 68:4 depicts God riding through the deserts (or clouds), paralleling the image of God bowing the heavens and coming down in Psalm 18:9.

Psalm 144:5 directly echoes 'Bow your heavens, O LORD, and come down!' — nearly identical wording to Psalm 18:9.

Deuteronomy 5:22 mentions thick darkness as the setting for God's voice, paralleling the darkness under God's feet in Psalm 18:9.

Deuteronomy 33:26 describes God riding through the heavens to help, a clear parallel to the theophany of Psalm 18:9.

2 Samuel 22:10 is the exact same verse as Psalm 18:9, part of a parallel passage — a direct citation.

Exodus 19:11 announces the Lord will come down on Sinai, a clear parallel to the descent described in Psalm 18:9.

Exodus 20:21 describes thick darkness where God was, matching the darkness under God's feet in Psalm 18:9.

Exodus 3:8 has God saying 'I am come down' to deliver Israel, directly paralleling the 'came down' in Psalm 18:9.