זוהר, תרומה י״חZohar, Terumah 18

Segment 1א׳

וּלְבָתַר סִיהֲרָא דְּקָא מִתְפָּרְשַׁת מִסִּטְרָא אַחֲרָא בְּיוֹמָא דָּא, בְּגִין לְאִתְנָהֲרָא מִן שִׁמְשָׁא, וְדָא אִיהוּ לְדָוִד בְּשַׁנּוֹתוֹ אֶת טַעְמוֹ וְגוֹ'. וּלְבָתַר דְּאִתְפָּרְשַׁת מִנֵּיהּ, הָא אִתְחַבְּרָת בְּשִׁמְשָׁא. וְתוּשְׁבַּחְתָּא דָּא בְּכ"ב אַתְוָון, דְּאָעִיל בָּהּ שִׁמְשָׁא בְּסִיהֲרָא. וְתוּשְׁבַּחְתָּא דָּא, פְּרִישׁוּ דְּסִיהֲרָא מִסִּטְרָא אַחֲרָא, וְתוּשְׁבַּחְתָּא דְּכ"ב אַתְוָון בִּנְהִירוּ דְּשִׁמְשָׁא.

Then the Moon, when she separates herself from the “other side”-as on this day she does-in order to receive light from the sun, is alluded to in the Psalm following this one, namely (Ps. 34): “Of David, when he changed his behaviour towards Abimelech.” When the “other side” has separated itself from the “Moon”, then the latter is united with the “Sun”, and therefore this Psalm begins (acrostically) with the twenty-two letters of the Hebrew alphabet, signifying the merging of the Sun with the Moon.