וְהָיָ֣ה ׀ בַּיּ֣וֹם הַה֗וּא יִתָּקַע֮ בְּשׁוֹפָ֣ר גָּדוֹל֒ וּבָ֗אוּ הָאֹֽבְדִים֙ בְּאֶ֣רֶץ אַשּׁ֔וּר וְהַנִּדָּחִ֖ים בְּאֶ֣רֶץ מִצְרָ֑יִם וְהִשְׁתַּחֲו֧וּ לַיהוָ֛ה בְּהַ֥ר הַקֹּ֖דֶשׁ בִּירוּשָׁלִָֽם׃
און עס װעט זײַן אין יענעם טאָג, װעט געבלאָזן װערן אין אַ גרױסן שופֿר, און עס װעלן קומען די פֿאַרלאָרענע אין לאַנד אשור, און די פֿאַרשטױסענע אין לאַנד מצרַיִם, און זײ װעלן זיך בוקן צו גאָטאױפֿן הײליקן באַרג אין ירושלים.
Rashi
those lost in the land of Assyria Since they were scattered in a distant land, within the Sambatyon River, he calls them, ‘lost.’
Ibn Ezra
And it shall come to pass in that day, etc. Then all the children of Ephraim34Since Assyria and Egypt are named in this verse, and not Babylon, this prophecy is referred to the exile of the ten tribes, who will be glad to have an opportunity of returning to Jerusalem, and of joining their brethren in the worship of God. that are in exile will hasten to return to Jerusalem, seeing that their own kingdom has ceased to exist.
Tze'enah Ure'enah
“On that day, a great shofar will blow, etc.” [27:13]. All of Israel will be ingathered quickly, like one would blow with a great shofar, so that the whole world will hear and those who were lost in the land of Assyria, behind the river Sambatyon, will come. Those who were driven out to the land of Egypt will bow down to God on the holy mountain in Jerusalem.7Rashi, Isaiah, 27:13.