Midrasz do Izajasza 2:9

R. Jacob the son of Yohai, in the name of R. Jonathan, explained the text: And man boweth down, and man lowereth himself (Isa. 2:9). And man boweth down alludes to the Israelites, as it is said: And ye My sheep, the sheep of My pasture, are men (Exod. 34:31), while man lowereth himself refers to Moses, as it is said: Now the man Moses was very meek (Num. 12:3). Moses cried out: Master of the Universe, I know that Israel lowered itself before a calf, but I too lowered myself; will You not forgive them? He replied: You will forgive them. Hence, When thou takest the sum (forgivest them).¹⁰“Take the sum” (lit. “lift up the head”) is an idiom meaning “forgive.”