עַ֣ל אֲשֶׁר֩ יִֽהְיֶה־שָּׁ֨ם הָר֤וּחַ לָלֶ֙כֶת֙ יֵלֵ֔כוּ שָׁ֥מָּה הָר֖וּחַ לָלֶ֑כֶת וְהָאוֹפַנִּ֗ים יִנָּשְׂאוּ֙ לְעֻמָּתָ֔ם כִּ֛י ר֥וּחַ הַחַיָּ֖ה בָּאוֹפַנִּֽים׃
Whithersoever the spirit was to go, as the spirit was to go thither, so they went; and the wheels were lifted up beside them; for the spirit of the living creature was in the wheels.
Read kabbalistic (mystical) interpretation of Ezekiel 1:20: and classical mystical sources.