42:8מ״ב:ח׳
1 א

ויכר יוסף וגו'. לְפִי שֶׁהִנִּיחָם חֲתוּמֵי זָקָן:

'ויכר יוסף וגו AND JOSEPH RECOGNISED HIS BRETHREN etc. — because, when he left them they were full-bearded (Yevamot 88a).

2 ב

והם לא הכרהו. שֶׁיָּצָא מֵאֶצְלָם בְּלֹא חֲתִימַת זָקָן, וְעַכְשָׁו בָּא בַחֲתִימַת זָקָן (כתובות כ"ז):

והם לא הכירהו BUT THEY RECOGNISED HIM NOT — because when he left them he had no beard whereas now he had grown a beard.

3 ג

וּמִ"אַ ויכר יוסף את אחיו כְּשֶׁנִּמְסְרוּ בְיָדוֹ הִכִּיר שֶׁהֵם אֶחָיו וְרִחֵם עֲלֵיהֶם, וְהֵם לֹא הִכִּירוּהוּ כְּשֶׁנָּפַל בְּיָדָם לִנְהֹג בּוֹ אַחְוָה:

A Midrashic explanation is: ויכר יוסף את אחיו JOSEPH RECOGNISED HIS BRETHREN — Now that they were in his power he recognised them as his brothers and had pity on them, והם לא הכירהו but when he fell into their power, “they did not recognize him” as their brother, by acting towards him in brotherly manner (Genesis Rabbah 91:7).