'Peace' in the Bible

Then the king sent an answer to Rehum, the chief ruler, and Shimshai the scribe, and their friends living in Samaria, and to the rest of those across the river, saying, Peace to you:

They sent him a letter saying, To Darius the king, all peace:

Artaxerxes, king of kings, to Ezra the priest, scribe of the law of the God of heaven, all peace;

So now do not give your daughters to their sons or take their daughters for your sons or do anything for their peace or well-being for ever; so that you may be strong, living on the good of the land, and handing it on to your children for a heritage for ever.