Never be lacking in zeal, but keep your spiritual fervor, serving the Lord. - Romans 12:11

It’s not enough to believe.

Whoever serves me must follow me; and where I am, my servant also will be. My Father will honor the one who serves me. - John 12:26

But be sure to fear the LORD and serve him faithfully with all your heart; consider what great things he has done for you. - 1 Samuel 12:24