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The punishment for one who nullifies the Mitzvah of Tzitzis is very great. On such a person the verse states “I will hold onto the corners of the earth [and shake the Reshaim off from it].” [One who nullifies the Mitzvah of Tzitzis is excommunicated from Heaven.]
 24/8; Michaber 24/6; Menachos 43b; Ketzos Hashulchan 7/12; The Gemara ibid states that one who nullifies the Mitzvah of the white strings of Tzitzis is greater than one who nullifies the Mitzvah of Techeiles of Tzitzis.
 Seemingly this refers to one who wears a four cornered garment without Tzitzis, however see Halacha 6 that in times of anger one is punished for not wearing a four cornered garment with Tzitzis. See Admur in Hilchos Talmud Torah 3 KU”A 1 “The punishment for nullifying a Mitzvah even though one is exempt, such as Tzitzis.”
 Iyov 38/13
 Pesachim 113b; Chesed Lealafim 24/2; Kaf Hachaim 24/23