'Firm' in the Bible

if indeed ye abide in the faith founded and firm, and not moved away from the hope of the glad tidings, which ye have heard, which have been proclaimed in the whole creation which is under heaven, of which I Paul became minister.

For although I am physically absent, I am with you in spirit, rejoicing to see how stable you are and how firm your faith in the Messiah is.

rooted and built up in him and firm in your faith just as you were taught, and overflowing with thankfulness.

Epaphras, who is one of you and a bond-servant of Christ Jesus, sends you greetings. [He is] always striving for you in his prayers, praying with genuine concern, [pleading] that you may [as people of character and courage] stand firm, [spiritually mature] and fully assured in all the will of God.