Commentary for Menachot 81:13
אמר ליה ענשיתו אעשה אמר ליה בזמן דאיכא ריתחא ענשינן
Rabbah son of R'Huna once visited the house of Raba B'R'Nahman and saw that the latter was wearing a garment that was folded over, the fringes being inserted in the folded corners.
Tosafot on Menachot
Do you punish [even for a positive commandment: of this type]. For a man is not obligated to purchase a cloak that requires [tsitsit], if [he] does not [have one]. But concerning a full positive commandment (in which the Torah obligates us to do something), even the earthly court may strike him until he dies.
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