'Let Us' in the Bible

Be of good courage, and let us play the men for our people, and for the cities of our God: and the LORD do that which seemeth him good.

And the king said to Absalom, Nay, my son, let us not all now go, lest we be chargeable unto thee. And he pressed him: howbeit he would not go, but blessed him.

And David said unto all his servants that were with him at Jerusalem, Arise, and let us flee; for we shall not else escape from Absalom: make speed to depart, lest he overtake us suddenly, and bring evil upon us, and smite the city with the edge of the sword.

Then said Absalom, Call now Hushai the Archite also, and let us hear likewise what he saith.

And David said unto Gad, I am in a great strait: let us fall now into the hand of the LORD; for his mercies are great: and let me not fall into the hand of man.