bible.com/bible/59/rom.12.21.ESV
Refers to an ancient Egyptian custom in which a person who wanted to show public contrition carried a pan of burning coals on his head. The coals represented the burning pain of his shame and guilt. When believers lovingly help their enemies, it should bring shame to such people for their hate and animosity (cf. Pr 25:21 , 22 ).
Living Waters 