Genesis 42:38
Psalms 6:5
5. (Compare Ps 115:17, 18; Isa 38:18). There is no incredulity as to a future state. The contrast is between this scene of life, and the grave or Sheol, the unseen world of the dead.
give . . . thanks—or, "praise for mercies." Jonah 2:2
2. His prayer is partly descriptive and precatory, partly eucharistical. Jonah incorporates with his own language inspired utterances familiar to the Church long before in Jon 2:2, Ps 120:1; in Jon 2:3, Ps 42:7; in Jon 2:4, Ps 31:22; in Jon 2:5, Ps 69:1; in Jon 2:7, Ps 142:3; 18:6; in Jon 2:8, Ps 31:6; in Jon 2:9, Ps 116:17, 18, and 3:8. Jonah, an inspired man, thus attests both the antiquity and inspiration of the Psalms. It marks the spirit of faith, that Jonah identifies himself with the saints of old, appropriating their experiences as recorded in the Word of God (Ps 119:50). Affliction opens up the mine of Scripture, before seen only on the surface.
out of the belly of hell—Sheol, the unseen world, which the belly of the fish resembled.