Said Rabbi Shimon bar Yochai: When a person rises in the morning and dons the tefillin and tzitzit … the Divine Presence dwells upon this person and proclaims: “You are My servant, Israel, in whom I will be glorified!” — ZoharChadash, Terumah 41d.
G‑d told Abraham: “You told the king of Sodom, ‘Neither from a thread to a shoe strap, nor will I take from whatever is yours’ (Genesis 14:23). I swear that as a reward I will give your children the mitzvah of the tzitzit thread.” — Midrash Rabbah Genesis 43:13.
One who meticulously observes the mitzvah of tzitzit is rewarded with [the resources to afford] a nice wardrobe. — Talmud Shabbat 23b.