The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
revengers
Hebrew, "goel", Redemption (Kinsman type).
(See Scofield) - (Isa 59:20).
angel
(See Scofield) - (Heb 1:4).
saw not the king's face
Not so had God taught David to forgive. Legalists have thought Absalom's wilfulness to have been due to over-indulgence on the part of David. There is no such intimation in Scripture. Rather it would seem that had David at this time taken Absalom into intimacy, the rebellion might have been averted.
sons
(See Scofield) - (Sa2 18:18).