'In the Faith' in the Bible

He will also make you stand firm [in the faith] to the end [of your lives], so that you will be [considered] without just blame on the day when our Lord Jesus Christ [returns].

But I, Brothers, could not speak to you as men with spiritual insight, but only as worldly-minded-mere infants in the Faith of Christ.

Though you may have thousands of instructors in the Faith of Christ, yet you have not many fathers. It was I who, through union with Christ Jesus, became your father by means of the Good News.

Still, all men have not that knowledge: but some, being used till now to the image, are conscious that they are taking food which has been offered to the image; and because they are not strong in the faith, their minds are troubled.

So, the person who thinks he is standing firm [in the faith] should pay attention [to his life], so that he does not fall [away from God].

Therefore, my dearly loved brothers, stand firm [in the faith]; do not be moved [from your commitment]. Always do your best to work for the Lord, since you know that your labor in the Lord's [service] is not for nothing.

Watch ye, stand fast in the faith, quit you like men, be strong.