Alma 13

Now when Ammon and his brethren separated themselves in the borders of the land of the Lamanites, behold, Aaron took his journey towards the land which was called by the Lamanites, Jerusalem, calling it after the land of their fathers’ nativity; and it was away joining the borders of Mormon. Now the Lamanites, and the Amlicites, and the people of Amulon had built a great city which was called Jerusalem. Now the Lamanites, of themselves, were sufficiently hardened; but the Amlicites and the Amulonites were still harder. Therefore, they did cause the Lamanites that they should harden their hearts, that they should wax stronger in wickedness and their abominations.