The Lord Jesus Christ is both David's Creator and his descendant (Matthew 22:41-46). That can only be true if He is indeed both God and Man.

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8