New Defender's Study Bible Notes
41:3 sickness. This is the only time this word is used in the Book of Psalms. It is the same word translated “grief” in Isaiah 53:3.
41:9 familiar friend. This prophecy was fulfilled by Judas at the Last Supper (John 13:18), thus confirming that the main context of the psalm is the betrayal of Christ.
41:13 Amen, and Amen. Book I of the Psalms closes with this doxology. Note also Psalm 72:18-20; 89:52; 106:48; 145:21; 150:6. A similar doxology ends each of the five books in the Psalms.
Psalm 42 (title) sons of Korah. This is the first of eleven psalms referring to “the sons of Korah” (Psalm 42, 44–49, 84, 85, 87, 88). The sons of Korah were a Levitical singing group during the reigns of David and Solomon (I Chronicles 6:16,22-48).