פירוש על קידושין 68:7

The Talmud has now boxed itself into a discursive corner—if we don’t learn from two verses that “come as one” why not say that tefillin and pilgrimage are also two verses that come as one, for they are both positive time-bound commandments which explicitly exclude women?

The Talmud now explains that we actually needed the Torah to exempt women in both the case of tefillin and pilgrimage. Had the Torah stated the rule with regard to one, I would not have been able to derive the other.
Had we not learned that women are exempt from pilgrimage (at all three festivals) I would have thought that just as they are obligated in “assembling” (at the end of seven years) so too they are obligated in pilgrimage.
And had I not learned that they were exempt from tefillin, I would have compared them to mezuzah, for they are right next to the mitzvah of mezuzah in the Shema.
Since we need both verses, this is not considered a case of “two verses that come as one.”