From Torah Law, I need only put tzitzis on my own four-cornered garment. From Rabbinic Law, I need to attach tzitzis to a borrowed garment only after 30 consecutive days, see Oruch HaShulchan, O Ch 14 (8) .

What are the sources that deal with the law in the following (theoretical) case:

I borrowed a garment and attached tzitzis before 30 days. 

Later (a) within the 30 days or (b) after the 30 days, I acquired the garment from the 

Am I obliged to remove the tzitzis because they were only attached to fulfill a rabbinic law or did the Rabbis give their mitzva the force of a Biblical law and the tzitzis can be left in place.

Related: Do you attach tzitzit on a borrowed garment? If so, do you later remove them?

  • Why are you equating "not required" with "not effective?" If you attach them, then it's not a problem of ta'aseh velo min ha'asui, which would be the only reason you'd need to reattach the tzitzit. – Isaac Kotlicky Mar 25 '16 at 12:40
  • When I attach them, I do not fulfil a Torah mitzva (of tztitzis). Later I need to have fulfilled that Torah mitzva. – Avrohom Yitzchok Mar 25 '16 at 12:45
  • 1
    How is this different from having tzitzis on a beged at night, and then day starting? – Double AA Mar 25 '16 at 12:59
  • No one says the tzitzit are considered non-existent, only that you are NOT OBLIGATED to put them on a borrowed beged, Their is no p'sul in the tzitzit, so they wouldn't fall under ta'aseh v'lo min ha'asui. – Isaac Kotlicky Mar 25 '16 at 13:42
  • @DoubleAA You mean, tying tzitzis on a beged at night, and then the day starting, I presume. Well, I could argue that when you tie them on at night, you are intending that the beged should be suited for the Torah mitzva in the morning, whereas in my case ... – Avrohom Yitzchok Mar 25 '16 at 13:46

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