Deuteronomy 28:52-53

52They will besiege you in all your cities until your high and fortified walls in which you trusted come down throughout your land; and they will besiege you in all your cities throughout your land which the Lord your God has given you.

53Then you will eat the offspring of your own body [to avoid starvation], the flesh of your sons and daughters whom the Lord your God has given you, during the siege and the misery by which your enemy will oppress you.