'Let Us' in the Bible

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

But the husbandmen seeing the Son, said among themselves, This is the heir; come let us kill him and seize on his inheritance.

Rise; let us be going: behold he that betrayeth me is at hand.

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