Or HaChaim on Exodus 12:5/אור החיים על שמות י״ב:ה׳

1 ומן העזים תקחו, "or you may take it from amongst the he-goats." The reason the Torah had to write the word תקחו, you shall purchase or take once more is to teach that it is permitted to use a goat even if one owns a sheep of the appropriate age group.