Yea, mine own familiar friend
Psalm 41 is the Psalm of the betrayal of the Son of man, as Jesus Himself taught. (John 13:18); (John 13:19). See Psalm 45, next in order of the Messianic Psalms.
trusted
( See Scofield) - (Psalms 2:12).
Related Commentaries of Psalms 41:9
Psalms 41:9
9 Yea, mine own familiar friend, in whom I trusted, which did eat of my bread, hath lifted up his heel against me.