Midrash su Salmi 89:16

If, owing to the iniquity of the generation, they do not hear anything at all; then, if one may say so, He is unable to let His glory abide among them. Happy were they who stood in that place in that hour, as it is said, "Happy is the people who know the joyful sound: they walk, O Lord, in the light of thy countenance" (Ps. 89:15); in the light of the countenance of the Holy One, blessed be He, they walk.

4 Rabbi Yoshayah opened [his discourse]: "Happy is the people who know the joyful blow; O Lord, they walk in the light of Your presence" (Psalms 89:16). Rabbi Abahu explained the Scripture [here] to be about the five elders that convene to make the year a leap year. What does the Holy One, blessed be He, do? He leaves His court above and descends and contracts His Divine Presence among them below. The ministering angels [then] say, "Where is the mighty One, where is the mighty One? Where is God, where is God - the One about whom it is written (Psalms 89:8), 'God who is lauded in the council of great holy ones,' leaves His court and contracts His Divine Presence among them below?" Why so much? So that if they err in a matter of law, the Holy One, blessed be He, enlightens their faces [to correct it]. This is [the understanding] of "they walk in the light of Your presence." Rabbi Yoshayah said, "It is written, 'Happy is the people who know the joyful blow.' And do the nations of the world not know how to blow? How many horns, and bugles and trumpets do they have? And you said, 'Happy is the people who know the joyful blow?' Rather it is that they know how to sway their Creator with the blow; and He stands up from His Throne of judgement and [moves] to the Throne of mercy and is filled up with mercy upon them. Then He reverses His attribute of judgement to the attribute of mercy. When? In the seventh month.