'For Us' in the Bible

It happened, when Joshua was by Jericho, that he lifted up his eyes and looked, and behold, a man stood in front of him with his sword drawn in his hand. Joshua went to him, and said to him, "Are you for us, or for our adversaries?"

The children of Joseph said, "The hill country is not enough for us. All the Canaanites who dwell in the land of the valley have chariots of iron, both those who are in Beth Shean and its towns, and those who are in the valley of Jezreel."

Is the iniquity of Peor too little for us, from which we have not cleansed ourselves to this day, although there came a plague on the congregation of the LORD,