הַכְּמַכַּ֥ת מַכֵּ֖הוּ הִכָּ֑הוּ אִם־כְּהֶ֥רֶג הֲרֻגָ֖יו הֹרָֽג׃
주께서 그 백성을 치셨은들 그 백성을 친 자들을 치심과 같았겠으며 백성이 살륙을 당하였은들 백성을 도륙한 자의 살륙을 당함과 같았겠느냐
Ibn Ezra
And you shall make: Our predecessors said that the form of the keruvim were like two youths, and that its meaning is "like a baby (keravya)" in Aramaic, and that the [letter] kaf is [a prefix]. Yet they spoke correctly, that they have the form of children - if they have a tradition, and they made the word a mnemonic, like chanukah [is used]. For the kaf [in] keruv is [part of the] root. And the testimony ([is in] verse 20 of this chapter), "and hakeruvim were" - since the [letter] hay [at the beginning of the word (ha)] is a definitive hay and not one of questioning, like the hay (in Isaiah 27:7), "Was he beaten as his beater has been?" (Had the hay been used as a questioning hay, the kaf could have been part of the root.)