'For Us' in the Bible

And it came to pass, when Joshua was by Jericho, that he lifted up his eyes and looked, and, behold, there stood a man opposite him with his sword drawn in his hand: and Joshua went unto him, and said unto him, are you for us, or for our adversaries?

But the children of Joseph said, The hill is not enough for us: and all the Canaanites that dwell in the land of the valley have chariots of iron, both they who are of Bethshean and its villages, and they who are in the valley of Jezreel.

Is the iniquity of Peor too little for us, from which we are not cleansed until this day, although there was a plague in the congregation of the LORD,