וָאֵ֖רֶא הַחַיּ֑וֹת וְהִנֵּה֩ אוֹפַ֨ן אֶחָ֥ד בָּאָ֛רֶץ אֵ֥צֶל הַחַיּ֖וֹת לְאַרְבַּ֥עַת פָּנָֽיו׃
Now as I beheld the living creatures, behold one wheel at the bottom hard by the living creatures, at the four faces thereof.
Rashi on Ezekiel
one wheel [was] on the ground On the floor of the expanse.
Rashi on Ezekiel
for its four faces of each living being, or the wheel had four faces. Our Rabbis said (Chag. 13b): “This is Sandalphon [the angel], who stands on the ground yet whose head reaches up among the living beings.” From the context we learn that the wheels were four.