'Firm' in the Bible

You are of your father the devil, and you want to do the desires of your father! That one was a murderer from the beginning, and does not stand firm in the truth, because truth is not in him. Whenever he speaks the lie, he speaks from his own [nature], because he is a liar and the father {of lies}.

Well said! They were broken off because of unbelief, but you stand firm because of faith. Do not think arrogant [thoughts], but be afraid.

But he who stands firm in his heart, not having necessity, but has authority concerning his own will, and has decided this in his own heart, to keep his own virgin, he will do well.

Be on the alert, stand firm in the faith, act courageously, be strong.

And our hope for you [is] firm, [because we] know that as you are sharers in the sufferings, so also [you will be sharers] in the comfort.

Not that we lord it over your faith, but we are fellow workers for your joy, because by faith you stand firm.

For freedom Christ has set us free. Stand firm, therefore, and do not be subject again to a yoke of slavery.

Only lead your lives in a manner worthy of the gospel of Christ, so that whether I come and see you or am absent I hear {your circumstances}, that you are standing firm in one spirit, with one soul contending side by side for the faith of the gospel,

So then, my beloved and greatly desired brothers, my joy and crown, thus stand firm in the Lord, dear friends.

because now we live, if you stand firm in the Lord.

So then, brothers, stand firm and hold fast to the traditions which you were taught, whether by [spoken] word or by letter from us.

However, the solid foundation of God stands firm, having this seal: "The Lord knows those who are his," and "Everyone who names the name of the Lord must abstain from unrighteousness."

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

Through Silvanus, the faithful brother (as I consider [him]), I have written to you {briefly} to encourage [you] and to attest that this is the true grace of God. Stand firm in it.