וְאָכַלְתָּ֣ פְרִֽי־בִטְנְךָ֗ בְּשַׂ֤ר בָּנֶ֙יךָ֙ וּבְנֹתֶ֔יךָ אֲשֶׁ֥ר נָֽתַן־לְךָ֖ יְהוָ֣ה אֱלֹהֶ֑יךָ בְּמָצוֹר֙ וּבְמָצ֔וֹק אֲשֶׁר־יָצִ֥יק לְךָ֖ אֹיְבֶֽךָ׃
And thou shalt eat the fruit of thine own body, the flesh of thy sons and of thy daughters whom the LORD thy God hath given thee; in the siege and in the straitness, wherewith thine enemies shall straiten thee.
Read midrashic interpretation of Deuteronomy 28:53: and classical rabbinic exegesis.