'Firm' in the Bible

The Lord is my rock, my fortress, and the One who rescues me;My God, my rock and strength in whom I trust and take refuge;My shield, and the horn of my salvation, my high tower—my stronghold.

Let the words of my mouth and the meditation of my heartBe acceptable and pleasing in Your sight,O Lord, my [firm, immovable] rock and my Redeemer.

Do not be like the horse or like the mule which have no understanding,Whose trappings include bridle and rein to hold them in check,Otherwise they will not come near to you.

For there are no pains in their death,Their body is fat and pampered.

My flesh and my heart may fail,But God is the rock and strength of my heart and my portion forever.

Lamedh.Forever, O Lord,Your word is settled in heaven [standing firm and unchangeable].

Blessed be the Lord, my Rock and my great strength,Who trains my hands for warAnd my fingers for battle;