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

“Then He begins to answer them, giving them a sign not from heaven, which they were unworthy to see, but giving it them from the deep beneath. But to His own disciples He gave a sign from heaven, to whom He shewed the glory of His blessed eternity both in a figure on the mount, and after in verity when He was taken up into heaven. Wherefore it follows, And there shall no sign he given it, but the sign of the Prophet Jonas.”