Variantly: "in it," (i.e., the interdict applies to the Pesach) and not to other offerings. For (without the verse it would follow otherwise, viz.:) If with Pesach, of lesser stringency, he transgresses "And a bone shall you not break in it," how much more so with offerings of greater stringency! It is, therefore, (to indicate otherwise) written "in it," but not in other offerings.
The Prohibition Against Breaking the Bones of the Pesach Passover
Mekhilta Tractate Pischa 15:17