The Zarahemla brethren were inhabitants of the land of Zarahemla who mocked the sons of Mosiah when those four announced they would go up to the land of Nephi to preach to the Lamanites. Recounting the episode years later, Ammon recalled that when they told their brethren of the plan, the people “laughed us to scorn” (Alma 26:23).
Their objection, as Ammon reports it, was that the Lamanites could not be brought to the truth or persuaded out of the traditions of their fathers, being a people whose days were spent in iniquity and whose hearts delighted in bloodshed (Alma 26:24). Rather than convert them, the brethren proposed taking up arms to destroy the Lamanites and their iniquity out of the land, lest the Lamanites overrun and destroy the Nephites (Alma 26:25).