'Let Us' in the Bible

Lo! when we are coming into the land, this cord of crimson thread, must thou bind in the window by which thou didst let us down, and, thy father and thy mother and thy brethren and all the household of thy father, must thou gather together unto thee unto the house.

We said, therefore, Let us prepare, we pray you, to build us an altar, - not for ascending-offering, nor for sacrifice;