פירוש על ישעיהו 5:1

I will now sing for my beloved The prophet says: “I will now sing for my beloved and in his place and as his messenger. [The word לִידִידִי would usually mean, ‘to my beloved.’] Similar to (Exodus 14: 4): “The Lord will wage war for you (לָכֶם), for you [not ‘to you’].”

נא Now. נא is always identical in meaning with עתה now.¹The identity of נא and עתה is often mentioned by our author, as if he thereby wished emphatically to exclude the meaning of I pray thee; compare Talmud Babli, Berachoth, p. 9, אין נא אלא ל׳ בקשה, the word נא means always ‘I pray thee,’ and Rashi on Gen. 19:18.

the song of my beloved about his vineyard This is the song of my beloved that he sang for his vineyard, about his vineyard, as (Genesis 26:7): “And the people of the place asked about his wife (לְאִשְׁתּוֹ), about his wife [not ‘to his wife’].”