'We Have Sinned' in the Bible

Then said Aaron unto Moses, - Oh my lord, do not I beseech thee lay upon us sin, although we have made ourselves foolish, and although we have sinned.

So they arose early in the morning, and went up into the top of the mountain, saying, - We are here - therefore will we go up into the place as to which Yahweh hath said that we have sinned.

Then tame the people of Israel unto Moses and said - We have sinned in that we spake against Yahweh and against thee, Pray thou unto Yahweh, that he may take from us the serpent. So Moses prayed for the people.