Rabanus Maurus — as excerpted in the Catena Aurea on Matthew 12:38-40

“He shews that the Jews were as criminal as the Ninevites, and that unless they repented they would be destroyed. But like as punishment was denounced against the Ninevites, and at the same time a remedy was set before them, so neither should the Jews despair of pardon, if at least after Christ’s resurrection they should do penitence. For Jonas, that is The Dove, or The mourner, is a sign of Him on whom the Holy Spirit descended in the form of a Dove, and who bare our sorrows. (Is. 53:4) The fish which swallowed Jonas in the sea, shews forth the death which Christ suffered in the world. Three days and nights was the one in the whale’s belly, the other in the tomb; the one was cast up on dry laud, the other arose in glory.”