"of the lambs and of the goats shall you take it": of each in itself. You say this, but perhaps both are required. It is, therefore, written (Leviticus 1:10) "And if from the sheep is his offering." Now does this not follow a fortiori, viz.: If a burnt-offering, of higher sanctity, is kasher (if brought) of one kind (only), a Pesach, of lower sanctity, how much more so! What, then, is the intent of "of the lambs and of the goats"? Of each in itself.
Why Did the Torah Bother Specifying from the Lambs and from the Goats
Mekhilta Tractate Pischa 4:3