Reference for Psalms 89:3

כִּֽי־אָמַ֗רְתִּי ע֭וֹלָם חֶ֣סֶד יִבָּנֶ֑ה שָׁמַ֓יִם ׀ תָּכִ֖ן אֱמוּנָתְךָ֣ בָהֶֽם׃

For I have said: 'For ever is mercy built; In the very heavens Thou dost establish Thy faithfulness.