Korach and Tzitzit

"Now Korah … betook himself.   What does Scripture say right before this?  “Speak to the Israelite people and instruct them to make for themselves fringes” (Num. 15:38).   Korah said to Moses, “Moses, if a tallit were entirely of blue wool (tekhelet), might it not be exempt from the commandment of fringes?”  Moses answered, “It must have fringes.”  Korah replied, “A tallit which is entirely woven of blue threads does not itself fulfill the commandment, but four threads do!?  If a house were full of scrolls, should it not be exempt from the commandment of mezuzah?”   Moses answered, “It must have a mezuzah.”   Korah continued, “The entire Torah contains 275 passages, yet it does not fulfill the commandment for the house; but the two passages in the mezuzah do?”   He accused him, “You were not commanded these things; rather, you dreamed them up in your heart!”   This is the meaning of Korah … betook himself."

http://www.biu.ac.il/JH/Parasha/eng/shelach/fris1.html
Bar-Ilan University's Parashat Hashavua Study Center