Numbers 15:32

[Bnei Yisroel] were in the desert and they found. Scripture speaks disparagingly of the Israelites. They kept only the first Shabbos, then this person came and desecrated the second.

And while the sons of Israel were dwelling in the wilderness, the decree of the Sabbath was known to them, but the punishment (for the profanation) of the Sabbath was not known. And there arose a man of the house of Joseph, and said with himself: I will go and pull up wood on the Sabbath day; and witnesses saw it, and told Mosheh; and Mosheh sought instruction from the presence of the Lord, that he might teach me judgment, and make known the discipline of all the house of Israel. And the witnesses of the man who pulled up and collected wood came,

He placed next to this section the subject of the man who gathered sticks [on the Sabbath day] because it happened at this time, after the incident of the spies — this in accordance with the plain meaning of Scripture. And this is the meaning of [the phrase], and while the children of Israel were in the wilderness, for it was because the people tarried there on account of the above-mentioned decree, that this event happened. Afterwards He commanded the precept of Tzitzith (Fringes) in order that they would remember through it all the commandments, and not forget the Sabbath [as did the man who gathered the sticks], or any of the other Commandments.
Now the reason why Tzitzith have this [power of] reminding one of all the commandments is, as Rashi wrote, because the total numerical value of the letters of the [Scriptural] word tzitzith is six hundred, and together with the eighth threads and five knots, you have six hundred and thirteen [corresponding to taryag, the six hundred and thirteen commandments]. But I have not understood this, for the word tzitzith in the Torah is written without a [second] yod, = 90, yod = 10, tzade = 90, tav = 400. The sum total is thus 590 [and not 600 as Rashi wrote]. so the total numerical value is only five hundred and ninety! Moreover, the number of threads [to be used for each of the Fringes] in the opinion of the school of Hillel is only three [which, when passed through the hole at the corner form six threads — not eight, as Rashi mentioned], and the knots by law of the Torah [need only] be two; as the Rabbis have said:, 39a. See Vol. III, pp. 298-9, Notes 116-19, where this whole text of the Talmud is fully explained. “You must deduce from this that the upper knots in the Fringes are required by Scriptural law. For if you should think that they are not obligatory by Scriptural law, why then did the Torah have to state a [special] permission to use mingled stuff [of wool and linen] in Fringes! Do we not accept as the established law that if one joins two pieces together with only one stitch, it is not considered joined?”
Rather, the remembrance [of the commandments] is through the blue thread, which alludes to the all-inclusive attribute, which is bakol and which is the aim of All. Therefore He said, that ye may look upon it, and remember ‘kol’ (all), (All) is the all-inclusive attribute it therefore contains all the commandments of the Eternal, and hence the Rabbis have said that the commandment of Tzitzith is of equal importance to the total number of the commandments (Beiur Ha’lvush to Ricanti, quoting the text of Ramban). which is the commandments of the Eternal. This is why the Rabbis said: “[Why was blue chosen rather than any other color?] Because blue resembles the sea, the sea resembles heaven, and heaven resembles the Throne of Glory, etc.” The likeness is in the name, contains in it the word kol (all) it alludes by its very name to that all-inclusive attribute of Kol. as also in the shade of the color which is the termination of all colors [and which leads one from the blue in the Fringes to the blue of the sea etc., and finally to think of Him Who is on high], for in the distance all colors appear to be that shade. That is why it is called t’cheileth [which is also suggestive of the word tachlith (termination) since this is the end of all colors].

ויהיו בני ישראל במדבר, “While the Children of Israel were in the desert, etc.;” our sages say that if the Israelites had (all of them) observed a second Sabbath in a row, no nation could ever have achieve mastery over them. (Talmud, tractate Shabbat, folio 118). Whence do we know that the Sabbath on which they found the man gathering sticks was that second Sabbath? This is clear from the sequence of the words: ויהיו וימצאו, which means that as soon as they had been commanded all the rules of Sabbath observance, they found this man violating it. How do we know that this man was Tzelofchod? The letters in the sequence עצים ביום have the same numerical value as the letters in the name צלפחד. [The Israelites desecrated already the first Sabbath, when some of them went out to gather manna, compare Exodus 16,27. Ed.] Why has the paragraph about Tzelofchod been inserted in the Torah at this point? At the time when this man desecrated the Sabbath Moses had been saying to Hashem “Lord of the universe, it is written in the phylacteries that wearing them is in order to remind the wearer to talk about the Commandments, (Exodus 13,9) and You have forbidden the phylacteries being worn on the Sabbath.” (Talmud, tractate Menachot folio 36) If only Tzelofchod had worn his phylacteries on that Sabbath, he would have reminded himself of the prohibition of gathering sticks on the Sabbath.” Hashem answered him that He had already commanded the people a commandment to remind them of the laws of the Sabbath, and that is the wearing of the tzitzit on their prayer shawls. (four cornered garment requiring these fringes).