הִנֵּ֤ה אָֽנֹכִי֙ שֹׁלֵ֣חַ לָכֶ֔ם אֵ֖ת אֵלִיָּ֣ה הַנָּבִ֑יא לִפְנֵ֗י בּ֚וֹא י֣וֹם יְהוָ֔ה הַגָּד֖וֹל וְהַנּוֹרָֽא׃
看哪，在永恆者那偉大而可畏的日子來到以前，我必差遣先知以利亞到你們那裡去。
Rashi
Adonoy return us. Because he concludes with words of reproof, he had to repeat the preceding verse again,14In order to end on a note of consolation. and so did Yeshayahu, Trei Osor, and Koheles.