New answers tagged intent-accident-purposely
It seems he is basing himself on Shulchan Aruch YD 210:1 based on Bavli Shevuot 26b.
The strings for Tzitzit (whether they will be white or blue) need to be spun for the express purpose of use in Tzitzit. Some say the material needs to be carded for the express purpose of Tzitzit as well, but most are lenient about this. (Shulchan Aruch OC 11:1)
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