According to the Rambam, which single activity is sufficient to create a Torah-level kilayim prohibition?
The Rambam (H2) rules that any one of the three activities — making into a smooth mass, spinning, or weaving — is sufficient to incur a Torah-level prohibition, rejecting the Geonic view that all three are required.
Question 2
What is the minimum measure of a forbidden fiber that renders a garment kilayim?
H5 rules explicitly that there is no minimum measure for kilayim. Even a single thread of wool in a linen garment or linen in wool is forbidden, since both fibers remain significant and neither can nullify the other.
Question 3
When sheep wool is blended with camel wool to make thread, under what condition may that thread be combined with linen?
H6 rules that if the majority of the blend is camel wool, the entire mixture takes the character of camel wool and may be combined with linen. If it is half-and-half sheep's wool, it is forbidden.
Question 4
According to Torah law, what is the status of sitting on a soft spread (blanket) made of kilayim?
H12 explains that 'shall not come upon you' implies you may spread kilayim beneath you. It is only rabbinically forbidden to sit on even soft kilayim spreads, lest a strand become wound around one's flesh.
Question 5
If a person sees his Torah teacher wearing kilayim forbidden by Torah law in the marketplace, what must he do?
H29 rules that one must jump up and rip Torah-forbidden kilayim off a person immediately, even in the marketplace, even from one's teacher — because honor of people does not override a negative Torah prohibition.