The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
atonement
(See Scofield) - (Exo 29:33).
sons
Compare (Sa2 6:23).
The "five sons" were children of Michal's sister Merab, wife of Adriel, "whom she brought up for Adriel". (Sa1 18:19).
Philistines
Compare (Sa1 31:3-5
(See Scofield) - (Sa1 31:3).