'Let Us' in the Bible

Then they came to Zerubbabel and to the heads of families, and said to them, Let us take part in the building with you; for we are servants of your God, even as you are; and we have been making offerings to him from the days of Esar-haddon, king of Assyria, who put us here.

Let us now make an agreement with our God to put away all the wives and all their children, if it seems right to my lord and to those who go in fear of the words of our God; and let it be done in keeping with the law.