'Faint hearted' in the Bible

And the officers shall speak further to the people, and they shall say, Who is the man that is fearful and faint-hearted? Let him go and return to his house, lest his brothers' heart faint as well as his heart.

Now we exhort you, brothers, warn those who are unruly, comfort the faint-hearted, support the weak, be patient toward all.