'Let Us' in the Bible

But the tenants, on seeing his son, said to each other 'Here is the heir! Come, let us kill him, and get his inheritance.'

Up, and let us be going. Look! my betrayer is close at hand."

But the rest said: "Wait and let us see if Elijah is coming to save him." [However another man took a spear, and pierced his side; and water and blood flowed from it.]