'Let Us' in the Bible

If we live by the Spirit, let us walk also by the Spirit.

Let us not become vain-glorious, provoking one another, envying one another.

but let us not lose heart in doing good; for in due time, if we do not faint, we shall reap.

So then, as we have occasion, let us do good towards all, and specially towards those of the household of faith.