וָאֵ֖רֶא הַחַיּ֑וֹת וְהִנֵּה֩ אוֹפַ֨ן אֶחָ֥ד בָּאָ֛רֶץ אֵ֥צֶל הַחַיּ֖וֹת לְאַרְבַּ֥עַת פָּנָֽיו׃
내가 그 생물을 본즉 그 생물 곁 땅 위에 바퀴가 있는데 그 네 얼굴을 따라 하나씩 있고
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.