| Barnes' Notes on the Bible The Passover offering was the same as that of the New moon, and was repeated on each of the seven days of the festival, thus marking the importance and the solemnity of the occasion. The details of the offering had not been previously prescribed.
Gill's Exposition of the Entire BibleAnd in the fourteenth day of the first month,.... The month Nisan, as the Targum of Jonathan or Abib, which, upon the Israelites coming out of Egypt, and on that account, was made the first month; otherwise Tisri or September was the first month, see Exodus 12:2, is the passover of the Lord; a feast in which a lamb was killed and eaten, in memory of the Lord's passing over the houses of the Israelites, when he slew the firstborn in Egypt; see Exodus 12:6.
Keil and Delitzsch Biblical Commentary on the Old TestamentThe same number of sacrifices as at the new moon were to be offered on every one of the seven days of the feast of unleavened bread (Mazzoth), from the 15th to the 21st of the month, whereas there was no general festal offering on the day of the Passover, or the 14th of the month (Exodus 12:3-14). With regard to the feast of Mazzoth, the rule is repeated from Exodus 12:15-20 and Leviticus 23:6-8, that on the first and seventh day there was to be a Sabbath rest and holy meeting.
Geneva Study BibleAnd in the fourteenth day of the first month is the passover of the LORD.
Scofield Reference NotesMargin first month i.e. April.
Jamieson-Fausset-Brown Bible Commentary16-25. in the fourteenth day of the first month is the passover-The law for that great annual festival is given (Le 23:5), but some details are here introduced, as certain specified offerings are prescribed to be made on each of the seven days of unleavened bread [Nu 28:18-25].
Matthew Henry's Concise Commentary28:16-31 By the sacrifices enjoined in this chapter, we are reminded of the continued power of the sacrifice of Christ, and of our continual need to depend thereon. No hurrying employments, or perilous situations, or prosperous circumstances, should cause slackness in our religious exercises; but should rather stir us up to greater diligence in seeking help from, or giving thanks to the Lord. And all is to be accompanied with repentance, faith is the Lord Jesus, and love to him, and to produce true holiness in our conduct towards all men; otherwise God will abhor our most solemn services and abundant devotions. And Christ is able to supply the wants of every day, every week, every month, every year, every ordinance, every case. | 
