Matthew Poole and continuators on Deuteronomy 16:2

2 Thou shalt therefore sacrifice the passeover unto the LORD thy God, of the flock, and the herd, in the place which the LORD shall choose to place his Name there.

(i. e.) Either 1. properly and strictly so called, which was the Paschal Lamb, and so the Sheep and Oxen, which here follow, are mentioned onely as additional sacrifices, which were to be offered in the seven days of the Paschal solemnity, Numb. 28. 18, 19, &c. Or 2. Largely, to wit, for the Passeover-offerings, to wit, which were offered after the Lamb in the seven dayes, and so this very word is used 2 Chron. 35. 8, 9. And this signification seems necessary here, partly because it is here said to consist of the flock and of the herd, or, of Sheep and Oxen, and partly because it follows, ver. 3. Thou shalt eat no leavened bread with it, seven days shalt thou eat unleavened bread therewith, i. e. with the Passeover, which could not be done with the Passeover strictly so called, which was to be wholly spent in one day. Or 3. The Feast of the Passeover, and so the place may be rendred, Thou shalt therefore observe or keep the Feast of the Passeover (as those same Hebrew words are taken, Numb. 9. 5. Ios. 5. 10. 2 Chron. 35. 1, 17, 18. 19.) unto the Lord thy God, with Sheep, and with Oxen, as is prescribed Numb. 28. 18, &c.

Marginal references: chap. 12. 5.