'Let Us' in the Bible

Then they came to Zerubbabel, and to the heads of the fathers' houses, and said unto them, Let us build with you: for we seek your God, as you do; and we do sacrifice unto him since the days of Esar-haddon king of Assyria, who brought us up here.

Now therefore let us make a covenant with our God to put away all the wives, and such as are born of them, according to the counsel of my lord, and of those that tremble at the commandment of our God; and let it be done according to the law.