Also, perhaps one should notice that the last thing mentioned in parshas shlach is the mitzvah of tzitzis and techeilis. “
That is because those two things are (among other things)a tikkun for the cheit hameraglim, who went “la-tur es haAretz.”
If you look at the lashon used about tzitzis and techeiles, “v’lo sasuru (or in Ivrit Sefardit, lo taturu) acharei eineichem,”
which was exactly what the meraglim did, and the same shoresh word, TUR is used in both places in the Parsha). They saw things with their eyes that they turned to negatives, rather than positives about E”Y. The Tzitzis and Techeiles are reminders at how easily our eyes and hearts can lead us astray.