This niggun is to the words of the zemirah, “Bnei Heicholo”, written by the Arizal. The tune is said to be composed by the Alter Rebbe, although some say it was composed by Reb Hillel Particher. It is customarily sung on Shabbos after mincha.
בני היכלא בְּנֵי הֵיכְלָא דְּכָסִיפִין לְמֶחְזֵי זִיו זְעֵיר אַנְפִּין. יְהוֹן הָכָא בְּהַאי תַּכָּא דְּבֵהּ מַלְכָּא בְּגִלּוּפִין.צְבוּ לַחְדָא בְּהַאי וַעְדָא בְּגוֹ עִירִין וְכָל גַדְפִין.חֲדוּ הַשְׁתָּא בְּהַאי שַׁעְתָּא דְּבֵיהּ רַעְוָא וְלֵית זַעְפִּין.קְרִיבוּ לִי חֲזִי חֵילִי דְּלֵית דִּינִין דְּתָקִיפִין.לְבַר נַטְלִין וְלָא עָאלִין הֲנֵי כִּלְבֵין דְּחָצִיפִין.וְהָא אַזְמִין עֲתִיק יוֹמִין לְמִנְחָה, עַד יְהוֹן חָלְפִין.רְעוּ דִּילֵיהּ דְגַלֵי לֵיהּ לְבַטָּלָא לְכָל קְלִיפִין.יְשַׁוֵי לוֹן בְּנוֹקְבֵיהוֹן וְיִטַמְרוּן בְּגוֹ כֵפִין.אֲרֵי הַשְׁתָּא בְּמִנְחָתָא בְּחֶדָוָתָא דִזְעֵיר אַנְפִּין
You princes of the palace, who yearn to behold the splendor of Z’eir Anpin: Be present at this meal at which the King leaves His imprint. Exult, rejoice in this gathering together with the angels and all supernal beings; Rejoice now, at this most propitious time, when there is no sadness. Draw near to Me, behold My strength, for there are no harsh judgments.They are cast out, they may not enter, these [forces of evil which are likened to] insolent dogs. I herewith invite the “Ancient of Days” at this auspicious time, and [the powers of impurity] will be utterly removed. It is His revealed will to annul all the powers of impurity; He will hurl them into their abysses and they will hide in the clefts of the rocks. For this time of Minchah is a time of joy for Z’eir Anpin.