the way of righteousness - “the way of truth” (2Pe 2:2). Christian doctrine, and “the knowledge of the Lord and Savior.”
turn - back again; so the Greek.
from the holy commandment - the Gospel which enjoins holiness; in opposition to their corruption. “Holy,” not that it makes holy, but because it ought to be kept inviolate [Tittmann].
delivered - once for all; admitting no turning back.