'Let Us' in the Bible

Therefore let us keep our festival not with old yeast nor with the yeast of what is evil and mischievous, but with bread free from yeast--the bread of transparent sincerity and of truth.

And do not let us test the Lord too far, as some of them tested Him and were destroyed by the serpents.

If from merely human motives I have fought with wild beasts in Ephesus, what profit is it to me? If the dead do not rise, let us eat and drink, for tomorrow we are to die.

And as we have borne a resemblance to the earthy one, let us see to it that we also bear a resemblance to the heavenly One.