וַיְהִ֗י בְּעֶשְׂרִ֤ים וָשֶׁ֙בַע֙ שָׁנָ֔ה בָּֽרִאשׁ֖וֹן בְּאֶחָ֣ד לַחֹ֑דֶשׁ הָיָ֥ה דְבַר־יְהוָ֖ה אֵלַ֥י לֵאמֹֽר׃
און עס איז געװען אין זיבן און צװאַנציקסטן יאָר, אין ערשטן חודש, אין ערשטן טאָג פֿון חודש, איז געװען דאָס װאָרט פֿון גאָט צו מיר, אַזױ צו זאָגן:
Rashi
And it came to pass in the twenty-seventh year of the reign of Nebuchadnezzar. That year Egypt was delivered into his hand. This is what we learned in Seder Olam (ch. 26). In this book, there are many prophecies written in a non chronological order.
Tze'enah Ure'enah
“In the twenty-seventh year, on the first day of the first month” [29:17]. It was in the in the twenty-seventh year, on the first day of the first month. That is to say, when Nebuchadnezzar was king for twenty-seven years, the Holy One said that Egypt should fall into the hands of Nebuchadnezzar.8Rashi, Ezekiel, 29:17.