ע֤וֹד אֶבְנֵךְ֙ וְֽנִבְנֵ֔ית בְּתוּלַ֖ת יִשְׂרָאֵ֑ל ע֚וֹד תַּעְדִּ֣י תֻפַּ֔יִךְ וְיָצָ֖את בִּמְח֥וֹל מְשַׂחֲקִֽים׃
Again will I build thee, and thou shalt be built, O virgin of Israel; Again shalt thou be adorned with thy tabrets, And shalt go forth in the dances of them that make merry.
Rashi
Yet again will I rebuild you, then you shall be built You had two buildings made by men. Therefore, they were destroyed. Yet again will I rebuild you, I by Myself, a third building, and you shall be built forever. shall you be adorned Heb. תַּעְדִּי.
Tze'enah Ure'enah
“Again you shall plant vineyards” [31:4]. The practice is that when there are many enemies, they cannot show themselves to go to the fields or the vineyards that they had planted long ago. However, the Holy One said to Israel. When they will go out of the exile, they will plant vineyards and will not fear the nations and will redeem the vineyards in the fourth year. One is not supposed to eat the fruit of a vineyard until the fourth year. One must give all the fruit to be redeemed with dances and joy.2Radak, Jeremiah, 31:4.