'Art' 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 before him with his sword drawn in his hand. And Joshua went to him, and said to him: Art thou for us, or for our enemies?

And Joshua was old, advanced in age, and Jehovah said to him, Thou art old, advanced in age, and there remaineth yet very much land to take possession of.

And Joshua said unto them, If thou art a great people, then get thee up to the wood, and cut down for thyself there in the land of the Perizzites and of the giants, if the hill-country of Ephraim is too narrow for thee.

And Joshua spoke to the house of Joseph, to Ephraim and to Manasseh, saying, Thou art a great people, and hast great power: thou shalt not have one lot only,