REV 4:8

8 And the Arba HaChayyot [(four living beings)], each one of them had six wings and they were full of eynayim [(eyes)] without and within. And yomam valailah [(day and night)], they do not cease to rest but continue singing, kadosh, kadosh, kadosh, adonoi tzva'ot, the One who was and is and is to come.