May the gods do so to me and more also

This is an oath with great emphasis. See how you translated this in 1 Kings 19:2.

if even the ashes of Samaria will be enough for all the people who follow me to have a handful each

Ben-Hadad is threatening that his army will totally destroy everything in Samaria. (See: rc://en/ta/man/jit/figs-metaphor)