כִּֽי־אָמַ֗רְתִּי ע֭וֹלָם חֶ֣סֶד יִבָּנֶ֑ה שָׁמַ֓יִם ׀ תָּכִ֖ן אֱמוּנָתְךָ֣ בָהֶֽם׃
因為我曾說:«慈愛必永遠被建立;你在諸天之中堅立你的信實。»
Rashi
For I said, “Forever will it be built with kindness” For I said, “Forever the throne of David will be built with kindness,” as it is said (II Sam. 7:13): “and I shall establish the throne of his kingdom, etc.” Another explanation: I thought that the world would be built with Your kindness and that You would establish Your faithfulness in the heavens, to be established and made permanent. Now what is the faithfulness? That promise You promised David through Nathan the prophet, saying, “I formed a covenant with My chosen one to establish his seed until eternity.”