'Let Us' in the Bible

Then they came to Zerubbabel, and to the chief of the fathers, and said to them, Let us build with you: for we seek your God, as ye do; and we do sacrifice to him since the days of Esar-haddon king of Assur, who brought us up hither.

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.