He must pay back the lamb four times over

The amount the rich man was required to pay back to the poor man was to be four times what the little lamb cost. "He must pay the poor man four times the price of the lamb" (See: rc://en/ta/man/translate/translate-numbers and rc://en/ta/man/translate/figs-explicit)

pity

to feel sadness and love for someone who is suffering or hurt or not loved