ויבא עמלק וגו'. סָמַךְ פָּרָשָׁה זוֹ לְמִקְרָא זֶה, לוֹמַר, תָּמִיד אֲנִי בֵינֵיכֶם וּמְזֻמָּן לְכָל צָרְכֵּיכֶם וְאַתֶּם אוֹמְרִים הֲיֵשׁ ה' בְּקִרְבֵּנוּ אִם אָיִן, חַיֵּיכֶם שֶׁהַכֶּלֶב בָּא וְנוֹשֵׁךְ אֶתְכֶם וְאַתֶּם צוֹעֲקִים לִי וְתֵדְעוּ הֵיכָן אֲנִי? מָשָׁל לְאָדָם שֶׁהִרְכִּיב בְּנוֹ עַל כְּתֵפוֹ וְיָצָא לַדֶּרֶךְ, הָיָה אוֹתוֹ הַבֵּן רוֹאֶה חֵפֶץ וְאוֹמֵר, אַבָּא טֹל חֵפֶץ זֶה וְתֵן לִי וְהוּא נוֹתֵן לוֹ, וְכֵן שְׁנִיָּה, וְכֵן שְׁלִישִׁית, פָּגְעוּ בְאָדָם אֶחָד אָמַר לוֹ אוֹתוֹ הַבֵּן, רָאִיתָ אֶת אַבָּא? אָמַר לוֹ אָבִיו, אֵינְךָ יוֹדֵעַ הֵיכָן אֲנִי? הִשְׁלִיכוֹ מֵעָלָיו וּבָא הַכֶּלֶב וּנְשָׁכוֹ (תנחומא יתרו):
ויבא עמלק THEN CAME AMALEK — Scripture places this section immediately after this preceding verse (they said, “Is the Lord among us or not?”) to imply, “I am ever among you and ready at hand for every thing you may need, and yet you say, “Is the Lord among us or not?” By your lives, I swear that the hound (Amalek) shall come and bite you, and you will cry for Me and then you will know where I am!” A parable: it may be compared to a man who carried his son upon his shoulder, and went out on a journey. The son saw an article and said, “Father, pick up that thing and give it to me”. He gave it to him, and so a second time and so also a third time. They met a certain man to whom the son said, “Have you seen my father anywhere?” Whereupon his father said to him, “Don’t you know where I am?” — He, therefore, cast him off from himself and a hound came and bit him (Midrash Tanchuma, Yitro 3).
כי יד על כס יה. יָדוֹ שֶׁל הַקָּבָּ"ה הוּרְמָה לִשָּׁבַע בְּכִסְאוֹ לִהְיוֹת לוֹ מִלְחָמָה וְאֵיבָה בַעֲמָלֵק עוֹלָמִית, וּמַהוּ כֵּס וְלֹא נֶאֱמַר כִּסֵּא? וְאַף הַשֵּׁם נֶחֱלַק לְחֶצְיוֹ? נִשְׁבַּע הַקָּבָּ"ה שֶׁאֵין שְׁמוֹ שָׁלֵם וְאֵין כִּסְאוֹ שָׁלֵם עַד שֶׁיִּמָּחֶה שְׁמוֹ שֶׁל עֲמָלֵק כֻּלּוֹ, וּכְשֶׁיִּמָּחֶה שְׁמוֹ יִהְיֶה הַשֵּׁם שָׁלֵם וְהַכִּסֵּא שָׁלֵם, שֶׁנֶּאֱמַר "הָאוֹיֵב תַּמּוּ חֳרָבוֹת לָנֶצַח" (תהלים ט'), זֶהוּ עֲמָלֵק שֶׁכָּתוּב בּוֹ "וְעֶבְרָתוֹ שְׁמָרָה נֶצַח" (עמוס א'), "וְעָרִים נָתַשְׁתָּ אָבַד זִכְרָם הֵמָּה" (תהלים שם), מַהוּ אוֹמֵר אַחֲרָיו? "וַה' לְעוֹלָם יֵשֵׁב" — הֲרֵי הַשֵּׁם שָׁלֵם, "כּוֹנֵן לַמִּשְׁפָּט כִּסְאוֹ" — הֲרֵי כִּסְּאוֹ שָׁלֵם:
כי יד על כס יה BECAUSE THE HAND IS UPON THE THRONE OF JAH — the hand of the Holy One, blessed be He, is raised to swear by His throne that He will have war and enmity against Amalek to all eternity. And what is the force of כס — why does it not say as usual כסא? And the Divine Name, also, is divided into half (יה is only the half of the Tetragrammaton)! The Holy One, blessed be He, swears that His Name will not be perfect nor His throne perfect until the name of Amalek be entirely blotted out. But when his name is blotted out then will His (God’s) Name be perfect and His throne perfect, as it is said, (Psalms 9:7) “The enemy is come to an end, he whose swords were for ever” — and this refers to Amalek of whom it is written, (Amos 1:11; the paragraph is a prophecy against Edom — Esau — the father of Amalek) “he kept his wrath for ever”. The verse in the Psalm continues: “and thou didst uproot enemies, their very memorial is perished”, What does it say immediately after this? (Psalms 9:8) “But the Lord (the Divine Name as given here is the Tetragrammaton) shall now remain for ever” — you see that the Name will be perfect (after Amalek is entirely rooted out as is mentioned in v. 7); “He establishes his throne (כסאו not כס) in righteousness” — so you see that His throne will then be perfect (Midrash Tanchuma, Ki Tisa 11).