Kabbalah zu Tehillim 143:2

King David first said, “Examine me, Hashem, and prove me” (Tehillim 26:2), for I am not afraid of all the judgments, not even of this righteousness, for I am connected to it (David was the embodiment of Malchut). It is written, “I will behold your face in righteousness” (Ibid. 17:15), specifically with righteousness. I am not afraid of withstanding its judgments. After he sinned, he feared even justice, as written, “And enter not into judgment (justice) with your servant” (Ibid. 143:2). Come and see, when this righteousness (Tzedek) is sweetened by justice, it is called righteousness (tzedakah) with a feminine suffix, because it becomes the female part of Zeir Anpin called justice, and she receives Chassadim from him. And the world is sweetened with Chesed and filled by it as written, “He loves righteousness (tzedakah) and justice; the earth is full of the Chesed of Hashem” (Ibid. 33:5).