'Let Us' in the Bible

Then answered Peter, and said unto Jesus, Lord, it is good for us to be here: if thou wilt, let us make here three tabernacles; one for thee, and one for Moses, and one for Elias.

But when the husbandmen saw the son, they said among themselves, This is the heir; come, let us kill him, and let us seize on his inheritance.

Rise, let us be going: behold, he is at hand that doth betray me.

The rest said, Let be, let us see whether Elias will come to save him.