And when it is required to pour out Chesed or judgments, one rises above the other and one hides itself from its neighbor. That is, when judgments need to be bestowed, Chesed in the beard is covered and judgments are in force. When it is time to bestow Chesed, judgment in the beard hides and Chesed is in force (as said in section 150). Everything therefore is necessary, both the rule of Chesed and the rule of judgment. The purpose of one is to take revenge against the enemies of Israel; and one to have mercy on Israel. That is why King David desired this beard, as we explained (in the Greater Gathering, section 259) that King David spoke of nine features in the verse, “Out of distress I called upon Yah” (Tehillim 118:5); study there.
David in Zion
Idra Zuta 1:147