Deuteronomy 16:2

But you shall sacrifice the pascha before the Lord your God between the suns; and the sheep and the bullocks on the morrow, on that same day to rejoice in the feast at the place which the Lord will choose to make His Shekinah to dwell there.

flock for the fulfillment of the Paschal sacrifice,

and oxen for the festival peace-offerings. Corroborating evidence is found in “…and three thousand bullocks” [II Chronicles 35: 7] after Scripture had already stated “…and for the paschal offerings,” [ibid.] regarding the lambs and kids. Moreover, “five thousand” animals for paschal offerings, in addition to “five hundred oxen” [II Chronicles 35: 9], were given to the Levites. Here, too, Scripture first mentions the paschal offering, before mentioning the cattle. Compare, “you, and your household” [14: 26].

AND THOU SHALT SACRIFICE THE PASSOVER-OFFERING UNTO THE ETERNAL THY G-D THE FLOCK AND THE HERD. Its purport by way of the plain meaning of Scripture is similar to the expressions: the ox, the sheep, and the goats [which means: “the ox, ‘and’ the sheep … “]; Reuben, Simeon, Levi [which means: “Reuben, ‘and’ Simeon, ‘and’ Levi”], And here it means: “and thou shalt sacrifice the Passover-offering unto the Eternal thy G-d, ‘and’ the flock and the herd [thou shalt bring for the Festal-offering,” as will be explained]. Therefore, [because the flock and the herd are not used for the Passover-offering], he does not say “and thou shalt sacrifice the Passover-offering unto the Eternal thy G-d, ‘of’ the flock and ‘of’ the herd,” as He says in all places: ye shall bring your offering ‘of’ the cattle, ‘of’ the herd, or ‘of’ the flock; and if his offering be ‘of’ the flock;, Verse 10. if he offer ‘of’ the herd., 3:1. But here he commands concerning the Passover-offering, which is the sheep as He has previously mentioned; and sheep and herd, rams and goats and calves, to celebrate the Festal-offering on that day, just as he commanded concerning the Festivals of Weeks and Tabernacles, saying, And thou shalt keep the Festival of Weeks unto the Eternal thy G-d after the measure of the freewill offering of thy hand, meaning that he shall bring herd and sheep as peace-offerings in accordance with his means. So also he said with reference to Tabernacles, Seven days shalt thou keep a feast unto the Eternal thy G-d etc.,, Verse 15. and at the end he included all three [festivals] together., Verse 16. Similar to this [where the connecting letter vav — “and” is missing] is the verse: In the first month, in the fourteenth day of the month, ye shall have the Passover; a feast of seven days, unleavened bread shall be eaten, which means “‘and’ a feast of seven days.” We find this also in the Passover celebrated by King Josiah where it says, of the flock, lambs, and kids, all of them for the Passover-offerings … and three thousand bullocks, and afterwards it says, And they roasted the Passover [-offering] with fire according to the ordinance, and the holy offerings they boiled in pots, and in cauldrons, and in pans, and carried them quickly to all the children of the people., Verse 13. Thus Scripture explained there that the lambs and kids were all for the …

צאן ובקר, our sages explain this according to the plain meaning of the text, i.e. from the farmer’s flocks and herds, seeing that the voluntary vows, etc., which have to be presented on the altar have already been referred to in Numbers 29,39 as well as in Leviticus 23,38 as being due on these pilgrimage festivals.

ובקר, the cattle, of course, only as the festival offering, known as חגיגה. This was an offering that did not accompany the Passover on the original occasion in Egypt.