A stone mason used an iron chisel or a diamond point to carve images and texts on stones permanently. Idol worship had so hardened the people's thoughts, emotions, and will that change seemed impossible.
In Old Testament times, the corners of altars had projections called “horns” (for example, Exodus 27:1–2). According to covenant rules, when offering an animal sacrifice, they applied blood to these horns. How Baal worshipers treated them is unknown.