Possible meanings are 1) Ezekiel is speaking of the "creatures" of verse 19 as if they were one creature. Alternate translation: "the spirit of the living creatures was in the wheels" or 2) Ezekiel is using an idiom. Alternate translation: "the spirit of life was in the wheels" or "the living spirit was in the wheels" or 3) the spirit in the creatures and in the wheels is the same. Alternate translation: "the same spirit that gave life to the creatures also gave life to the wheels" (See: [[rc://en/ta/man/translate/figs-idiom]])