וַיַּ֥רְא יוֹסֵ֛ף אֶת־אֶחָ֖יו וַיַּכִּרֵ֑ם וַיִּתְנַכֵּ֨ר אֲלֵיהֶ֜ם וַיְדַבֵּ֧ר אִתָּ֣ם קָשׁ֗וֹת וַיֹּ֤אמֶר אֲלֵהֶם֙ מֵאַ֣יִן בָּאתֶ֔ם וַיֹּ֣אמְר֔וּ מֵאֶ֥רֶץ כְּנַ֖עַן לִשְׁבָּר־אֹֽכֶל׃
And Joseph saw his brethren, and he knew them, but made himself strange unto them, and spoke roughly with them; and he said unto them: ‘Whence come ye?’ And they said: ‘From the land of Canaan to buy food.’
Read kabbalistic (mystical) interpretation of Genesis 42:7: and classical mystical sources.