'Cowards' in the Bible

Therefore, being engaged in this service and being mindful of the mercy which has been shown us, we are not cowards.

Therefore we are not cowards. Nay, even though our outward man is wasting away, yet our inward man is being renewed day by day.

But as for cowards and the unfaithful, and the polluted, and murderers, fornicators, and those who practise magic or worship idols, and all liars--the portion allotted to them shall be in the Lake which burns with fire and sulphur. This is the Second Death."