'Steadfast' in the Bible

So then, my dear brothers, be steadfast, immovable, always abounding in the work of the Lord, [because you] know that your labor is not [in] vain in the Lord.

if indeed you remain in the faith, established and steadfast and not shifted away from the hope of the gospel that you heard, which was proclaimed in all creation under heaven, of which I, Paul, became a minister.

For we have become partners of Christ, if indeed we hold fast the beginning of [our] commitment steadfast until the end,

which we have like an anchor of the soul, both firm and steadfast, and entering into the inside of the curtain,

{Resist him}, steadfast in your faith, [because you] know the same [kinds] of sufferings are being accomplished by your community of believers in the world.