Midrash for Genesis 43:4

אִם־יֶשְׁךָ֛ מְשַׁלֵּ֥חַ אֶת־אָחִ֖ינוּ אִתָּ֑נוּ נֵרְדָ֕ה וְנִשְׁבְּרָ֥ה לְךָ֖ אֹֽכֶל׃

If thou wilt send our brother with us, we will go down and buy thee food;

Sefer HaYashar (midrash)