וְאָמַרְתָּ בַּיּוֹם הַהוּא אוֹדְךָ ה' כִּי אָנַפְתָּ בִּי — יָשֹׁב אַפְּךָ וּתְנַחֲמֵנִי

You will say on that day, the day of the Redemption: I thank You, Lord, although You were angry with me and You poured Your wrath upon me in the past. Now, let Your wrath subside, and may You comfort me. Alternatively, on that day, Israel will thank God that He was angry with them, as they will recognize that even their suffering throughout the generations was for the good.

הִנֵּה אֵל יְשׁוּעָתִי אֶבְטַח וְלֹא אֶפְחָד כִּי עָזִּי וְזִמְרָת יָהּ ה'וַיְהִי לִי לִישׁוּעָה

Here is the God of my salvation, and therefore I will trust and will not fear, as my strength and song [zimerat] is God the Lord; alternatively, strength and the pruning away [zemira] of evil are God’s, and He has been my salvation. Almost identical and equally unclear verses appears in Exodus (15:2) and in Psalms (118:14).

וּשְׁאַבְתֶּם מַיִם בְּשָׂשׂוֹן מִמַּעַיְנֵי הַיְשׁוּעָה

You will draw water with gladness from the springs of salvation. Whether the reference here is to material blessing and prosperity, or to knowledge of God and His Torah, salvation will reach the returnees like flowing water, and they will rejoice at this.

וַאֲמַרְתֶּם בַּיּוֹם הַהוּא הוֹדוּ לַה' קִרְאוּ בִשְׁמוֹ הוֹדִיעוּ בעַמִּים עֲלִילֹתָיו הַזְכִּירוּ כִּי נִשְׂגָּב שְׁמוֹ

You will say on that day: Thank the Lord, proclaim His name, announce among all the peoples His actions; declare that His name is exalted and strengthened in the world.

זַמְּרוּ ה' כִּי גֵאוּת עָשָׂה מוּדַעַת זֹאת בְּכָל הָאָרֶץ

Sing to the Lord, as He has performed grandeur. His actions demonstrate His strength and greatness over all, and this is known in the entire land.

צַהֲלִי וָרֹנִּי יוֹשֶׁבֶת צִיּוֹן כִּי גָדוֹל בְּקִרְבֵּךְ קְדוֹשׁ יִשְׂרָאֵל

Shout and sing, inhabitant of Zion, as the Holy One of Israel is great in your midst. God is coming to you, and His glory and praise will become enhanced through you.