Likutei Moharan, Part II 2:7/ליקוטי מוהר"ן·תנינא ב׳:ז׳

17. Now, this is the concept of Chanukah. The days of Chanukah are days of thanksgiving. They are the delight of the World to Come and halakhot, through which one merits perfected speech via the revelation of truth, as discussed above.

2This is the idea behind the oil of the Chanukah lights, as in “Let Your tumim and urim be with Your man of kindness” (Deuteronomy 33:8). Through the kindnesses/ halakhot, the light of truth is revealed, as in “Your truth (tumim) and your light (urim).” This alludes to the oil, which is the light of truth, as in “Send forth Your light and Your truth” (Psalms 43:3).

3In addition, one is required to place [the Chanukah lights] adjacent to the opening [of one’s house]. This corresponds to “the openings of your mouth” (Micah 7:5)—i.e., speech. Truth radiates its light into the words, as in “The opening of Your words illuminates” (Psalms 119:130), and then the joy of Shabbat is drawn into the six days of the week by means of the Holy Tongue, perfected speech.

4This is ChaNUKaH : ChaNU KaH. [Chanu] signifies the rest of Shabbat, to which the Holy Tongue is linked. [KaH is] “KoH (Thus) shall you bless”—with the Holy Tongue, as discussed above.

5The joy of Shabbat illuminates the six weekdays, which are also identified with ChaNuKah: ChaNoKh/Metat/servant. His rule is during the weekdays, as in “This one will bring us relief from our work and from the toil of our hands.” This alludes to the joy of Shabbat being drawn into the six days of the week, as discussed above.