50:15נ׳:ט״ו
1 א

ויראו אחי יוסף כי מת אביהם. מַהוּ וַיִּרְאוּ? הִכִּירוּ בְּמִיתָתוֹ אֵצֶל יוֹסֵף, שֶׁהָיוּ רְגִילִים לִסְעֹד עַל שֻׁלְחָנוֹ שֶׁל יוֹסֵף וְהָיָה מְקָרְבָן בִּשְׁבִיל כְּבוֹד אָבִיו, וּמִשֶּׁמֵּת יַעֲקֹב לֹא קֵרְבָן (בראשית רבה):

ויראו אחי יוסף כי מת אביהם AND WHEN JOSEPH S BRETHREN SAW THAT THEIR FATHER WAS DEAD — What is the meaning of “and they saw”? They could perceive that he was dead through the conduct of Joseph. Previously they used to dine at Joseph’s table and he used to receive them with open arms out of respect to his father; after Jacob’s death, however, he no longer treated them in a friendly manner (Tanchuma Yashan 2:1:2; Genesis Rabbah 100:8).

2 ב

לו ישטמנו. שֶׁמָּא יִשְׂטְמֵנוּ; לוּ מִתְחַלֵּק לְעִנְיָנִים הַרְבֵּה; יֵשׁ לוּ מְשַׁמֵּשׁ בִּלְשׁוֹן בַּקָּשָׁה וּלְשׁוֹן הַלְוַאי, כְּגוֹן לוּ יְהִי כִדְבָרֶךָ, לוּ שְׁמָעֵנִי, וְלוּ הוֹאַלְנוּ, לוּ מַתְנוּ, וְיֵשׁ לוּ מְשַׁמֵּשׁ בִּלְשׁוֹן אִם וְאוּלַי, כְּגוֹן לוּ חָכְמוּ (דברים ל"ב), לוּ הִקְשַׁבְתָּ לְמִצְוֹתָי (ישעיהו מ"ח), וְלוּ אָנֹכִי שֹׁקֵל עַל כַּפַּי (שמואל ב י"ח); וְיֵשׁ לוּ מְשַׁמֵשׁ בִּלְשׁוֹן שֶׁמָּא, לוּ יִשְׂטְמֵנוּ, וְאֵין לוֹ עוֹד דּוֹמֶה בַמִּקְרָא, וְהוּא לְשׁוֹן אוּלַי, כְּמוֹ אֻלַי לֹא תֵלֵךְ הָאִשָּׁה אַחֲרָי, לְשׁוֹן שֶׁמָּא הוּא; וְיֵשׁ אוּלַי לְשׁוֹן בַּקָּשָׁה, כְּגוֹן אוּלַי יִרְאֶה ה' בְּעֵינִי (שמואל ב ט"ז), אוּלַי ה' אוֹתִי (יהושע י"ד), הֲרֵי הוּא כְּמוֹ לוּ יְהִי כִדְבָרֶךָ, וְיֵשׁ אוּלַי לְשׁוֹן אִם, אוּלַי יֵשׁ נ' צַדִּיקִם:

לו ישטמנו means PERHAPS HE WILL HATE US. The word has many different meanings. There are examples of לו used to denote a petition, having the meaning of “Oh that!” as for instance: (Genesis 30:34) “Would (לו) it might be according to thy word”; (Genesis 23:13) “Oh that thou wouldst (לו) only hear me”; (Joshua 7:7) “Would that (לו) we had been content”; (Numbers 14:2) “Would that (לו) we had died”. ,There are examples of לו used in the sense of “if” and “אולי” as, (Deuteronomy 32:29) “If (לו) they were wise [they would understand this]”; (Isaiah 48:18) “If (לוא) thou wouldst hearken to my commandments, [then would thy peace be as a river]”; (2 Samuel 18:12) “If (לו) I would receive [a thousand pieces of silver] in my hands, [yet would I not put forth my hand etc.]”. There is an example of לו used in the sense of “perhaps”, — in our verse — “Perhaps he will hate us”, but there is no other example of its usage in this sense in Scripture. Here it corresponds in sense with the word אולי, “perhaps”, as for example in (Genesis 24:5) “אולי the woman will not be willing to follow me” which means “perhaps she will not etc.” As a matter of fact אולי has all the meanings of לו, for there are examples of אולי denoting a petition as for instance (2 Samuel 16:12) “Perhaps (אולי) the Lord will look upon mine eye”, (where the context shows that this involves a kind of petition that God should do this); (Joshua 14:12) “Perhaps (אולי) the Lord will be with me [and I shall drive them out]”, (involving also a petition that God should do this), where אולי has a similar meaning to לו in (Genesis 30:34) “Would (לו) it might be according to thy word”. Then again the word אולי has the meaning of “if”; for example, (Genesis 18:24) “Perhaps (אולי) there are fifty righteous [wilt Thou destroy etc.]” (which is equivalent to “if there are fifty… wilt thou destroy?”.)