'Stand Fast' in the Bible

My loving-kindness will I keep for him for evermore, and my covenant shall stand fast with him;

Declare in Egypt, and publish in Migdol, and publish in Noph, and in Tahpanhes; say, Stand fast, and prepare thee; for the sword devoureth round about thee.

Be vigilant; stand fast in the faith; quit yourselves like men; be strong.

Christ has set us free in freedom; stand fast therefore, and be not held again in a yoke of bondage.

So that, my brethren, beloved and longed for, my joy and crown, thus stand fast in the Lord, beloved.