וְחָמֵ֣שׁ אַמּ֗וֹת כְּנַ֤ף הַכְּרוּב֙ הָֽאֶחָ֔ת וְחָמֵ֣שׁ אַמּ֔וֹת כְּנַ֥ף הַכְּר֖וּב הַשֵּׁנִ֑ית עֶ֣שֶׂר אַמּ֔וֹת מִקְצ֥וֹת כְּנָפָ֖יו וְעַד־קְצ֥וֹת כְּנָפָֽיו׃
Fünf Ellen lang war jeder Flügel des Cherub, somit zehn Ellen von einem Ende des Flügels bis zum andern Ende.
Rashi
It was ten amohs from one end of its wings to the [other] end of its wings. When they are spread, the wings of both [cherubs], which touched one another, filled the entire space of twenty amohs; and the bodies of the cherubim are not included in the measurement, and stood miraculously.37See Maseches Bava Basra 99a. Alternatively, the wings were attached to the cherubs in such a way that the two wings of each cherub touched each other without any space between them. Thus a miracle was not necessary.—Radak.