אַיֵּ֤ה ׀ חֲסָדֶ֖יךָ הָרִאשֹׁנִ֥ים ׀ אֲדֹנָ֑י נִשְׁבַּ֥עְתָּ לְ֝דָוִ֗ד בֶּאֱמוּנָתֶֽךָ׃
Where are Thy former mercies, O Lord, Which Thou didst swear unto David in Thy faithfulness?
Read kabbalistic (mystical) interpretation of Psalms 89:50: and classical mystical sources.