God is described as holy, which means He is set apart and distinct from His creation in purity and perfection. Isaiah has a vision of God on a heavenly throne, surrounded by angelic beings called seraphim who praise God's holiness. God's holiness permeates His entire being and creation. The Israelites are commanded to be holy as God is holy, reflecting His purity and set apart status. God is further described as light with no darkness, implying His absolute perfection and distinction from any imperfection.