As charcoal to embers and as wood to fire, so is a quarrelsome person for kindling strife.
NMV[As] coals [are] to burning coals, and wood to fire; so [is] a contentious (loving to quarrel and angrily debate) man to kindle strife.
OJBAs charcoal is to burning coals, and wood to eish; so is a contentious ish to kindle strife.
T4TPutting charcoal on burning coals or putting wood on a fire causes the fire to keep burning; similarly, people who like to quarrel cause people to keep arguing.