Likutei Moharan 11:4/ליקוטי מוהר"ן י״א:ד׳

14. And, this light [which leads him to repent] corresponds to the thirty-nine-lights which are encompassed in the vav of kavOd. This is alluded to in (Job 33:29), “God does all these things twice or three times with a man.” “<Three times>” corresponds to the thirty-nine-lights of the expanded first three letters <of the Tetragrammaton>. {To explain: The first three letters of the YHVH, when spelled out using the letter alef, have a numerical value of thirty-nine, corresponding to the thirty-nine-lights. They are thus encompassed in the VAV of God’s Name.} “With a man”—for [these lights] are included in the brit, [as in,] “For as a man is, so is his strength” (Judges 8:21). It is for this reason that the brit is referred to as Boaz: bo oz —in him, there is strength (Tikkuney Zohar #31).

2But when a person does not guard the brit, he damages the thirty-nine-lights and draws upon himself the yoke of earning a living—i.e., the thirty-nine-works. As is taught in the Zohar (III, 244a): One who throws away crumbs of bread is pursued by poverty. All the more so someone who throws away the “crumbs” of the mind.

3This is bo oz: Bo (in him) there are incorporated two aspects. There are the thirty-nine-lights <for> someone who guards the brit ; and there are the thirty-nine-works <for> someone who defiles it. For <the numerical value of> oz, counting the word itself, is twice thirty-nine.

4And this is the reason for the repetition in (Exodus 38:21), “[These are the accounts of the] Tabernacle, the Tabernacle….” Twice thirty-nine, because the thirty-nine-works are deduced from [the construction of] the Tabernacle (Shabbat 49b). Thus, someone who guards his brit, even though he engages in the thirty-nine-works, [his works] are an aspect of the works of the Tabernacle—i.e., the Tabernacle when built up, corresponding to the thirty-nine-lights. However, someone who defiles the brit, the work he does is an aspect of the Tabernacle when destroyed. This corresponds to the thirty-nine-lashes (Tikkuney Zohar, Introduction, p.12b), as in (Deuteronomy 25:3), “Forty lashes he may give him and not exceed.” This alludes to defiling the brit, which is an aspect of excesses, as explained.