וְעָשִׂ֛יתָ שְׁנַ֥יִם כְּרֻבִ֖ים זָהָ֑ב מִקְשָׁה֙ תַּעֲשֶׂ֣ה אֹתָ֔ם מִשְּׁנֵ֖י קְצ֥וֹת הַכַּפֹּֽרֶת׃
你要用金子造兩個基路伯,要用錘打的方式把它們從櫃蓋的兩端造出來。
Shenei Luchot HaBerit
The cherubs which covered the Ark with their wings had the faces of children. This symbolised that they were sin-free, just as the young children in Torah schools are free from sin. It applies to older as well as younger children. This may be the reason the Torah speaks about שנים כרובים, rather than about שני כרובים as we would have expected.