Charles Ellicott Commentary Mark 12:36

"David himself said in the Holy Spirit, The Lord said unto my Lord, Sit thou on my right hand, Till I make thine enemies the footstool of thy feet." — Mark 12:36 (ASV)

David himself said by the Holy Ghost.—St. Mark is more emphatic in ascribing the words of David to the influence of the Holy Spirit than either St. Matthew, who simply quotes, or St. Luke, who uses the more general phrase in spirit. (Compare to 2 Peter 1:21.)