מדרש אויף תהילים 92:3

(Psalms 92:2-5) "It is good to praise the L–rd and so sing to Your exalted name. To proclaim in the morning Your lovingkindness, and Your faithfulness in the nights. With a ten-stringed harp, with voice and lyre together. For You have gladdened me by Your deeds, O L–rd. At the work of Your hands I will sing." What made him worthy of this joy? The belief held by our fathers in this world, which is all "night." Thus, "to proclaim in the world (to come) Your lovingkindness and Your faithfulness in the 'nights'" (i.e., this world).

"To declare thy loving-kindness in the morning" (Ps. 92:2). Adam said: (This refers to) all who enter this world which is like unto the night; and to all who come into the world to come, which is like unto the morning. They shall declare the faithfulness and love of the Holy One, blessed be He, which He has shown to me, (for He has) delivered me from the judgment of Gehinnom, as it is said, "To declare thy loving-kindness in the morning, and thy faithfulness every night" (ibid.).

The Holy One, blessed be He, said: I desire of Israel the meditation of their mouths like the psaltery and an instrument of ten strings, as it is said, "With the meditation of || the harp" (Ps. 92:3).