'Let Us' in the Bible

But that it may spread no further among the people, let us severely threaten them, so that they speak no more to any man in this name.

And, after some days, Paul said to Barnabas, let us return, and visit our brethren in every city in which we have preached the word of the Lord, and see how they do.

We find no evil in this man; but if a spirit or an angel has spoken to him, let us not fight against God.