וָאֵ֖רֶא הַחַיּ֑וֹת וְהִנֵּה֩ אוֹפַ֨ן אֶחָ֥ד בָּאָ֛רֶץ אֵ֥צֶל הַחַיּ֖וֹת לְאַרְבַּ֥עַת פָּנָֽיו׃
Ketika aku memandang makhluk-makhluk hidup itu, tampaklah satu roda di atas tanah di samping makhluk-makhluk hidup itu, pada masing-masing dari keempat wajahnya.
Rashi
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.