וְעָשִׂ֥יתָ כַפֹּ֖רֶת זָהָ֣ב טָה֑וֹר אַמָּתַ֤יִם וָחֵ֙צִי֙ אָרְכָּ֔הּ וְאַמָּ֥ה וָחֵ֖צִי רָחְבָּֽהּ׃
Igualmente farás um propiciatório, de ouro puro; o seu comprimento será de dois covados e meio, e a sua largura de um côvado e meio.
Rashi on Exodus
כפרת — A cover for the ark which was made open on top. He laid it upon it, flat like an ordinary slab.
Kli Yakar on Exodus
And you shall make the cover: ... And the two keruvim resembled children, to teach that [only] if the teacher is like an angel of God and clean of all sin - like a one-year-old child - they should then seek Torah from his mouth. And he needs to be clean from [sin against] God and from [sin against] man. For the wings were pointed upward to [show] his fulfilling [his obligation] towards the Heavens. And one was looking towards the other [to show] his fulfilling [his obligation] towards the creatures, [and also] teaches about the peace that is given to those that love the Torah. And they were twins together in peace and friendship. (Verse 20:) "The faces of the cherubim being turned toward the cover" - that the entire endeavor of their attention (literally, faces) be to the Torah in the ark; not like those that are sages in their own eyes and expound for their own glory and not for the glory of the Torah.