Midrasch zu Wajikra 26:29

3) (Vayikra 26:29) "And you will eat the flesh of your sons, and the flesh of your daughters will you eat": They say of Doeg ben Yosef, who died and left a young child to his mother, that each year she would measure him by hand-breadth and give his weight in gold to the Temple. When they surrounded the citadel of Jerusalem, she slaughtered him with her own hand and ate him. And it is over her that Jeremiah keens (Eichah 2:20) "Shall women eat their fruit, their fondled ones ("measured by hand-breadth" and dedicated to the Temple)? And the Holy Spirit answers her (Eichah 2:20) "Shall there be killed in the Temple of the L–rd, Cohein and prophet!" — Zechariah ben Yehoyada the Cohein. "And you will eat the flesh of your sons, and the flesh of your daughters will you eat": What is the intent of this (seemingly redundant "will you eat")? This tells me only that fathers will eat the flesh of sons and daughters. Whence is it derived that sons will eat the flesh of fathers? From "will you eat." And thus is it written (Ezekiel 5:10) "Therefore, fathers will eat children in your midst, and children will eat their fathers."