'Faint hearted' in the Bible

Then shall the officers further speak unto the people, and say - Who is the man that is fearful and faint-hearted? let him go and return unto his house, - lest his brethren's heart melt as well as his heart.

And he was speaking a parable unto them, as to its being needful for them always to pray, and not be faint-hearted;

And, in doing that which is honourable, let us not be fainthearted; for, in due season, we shall reap, if we faint not.