'Firm' in the Bible

Howbeit the firm foundation of God standeth, having this seal, The Lord knoweth them that are his: and, Let every one that nameth the name of the Lord depart from unrighteousness.

but Christ as a son, over his house; whose house are we, if we hold fast our boldness and the glorying of our hope firm unto the end.

for we are become partakers of Christ, if we hold fast the beginning of our confidence firm unto the end: