The second Passover was a thanksgiving observance.
Deut 16:4 ... nor shall any of the meat that
which you sacrifice(offer in sacrifice)
the first day at twilight(evening,
ie sunset) remain over until morning.
Num 9:11 On the fourteenth day of the second
month, at twilight, they may keep it.
They shall eat it with unleavened
bread and bitter herbs.
:12 They shall leave none of it until
Lev 7:12 If he offers it for a thanksgiving, ...
:15 The flesh of the sacrifice of his peace offering
for thanksgiving shall be eaten the same day it
is offered. He shall not leave any of it until
Its first observance is referred to in Numbers chapter 9. At this time
the second month observance, for those who were unclean, was specified.
Num 9:1 Now the LORD spoke to Moses in the Wilderness
of Sinai, in the first month of the second year
after they had come out of the land of Egypt,
:2 "Let the children of Israel keep the Passover
at its appointed time.
:6 Now there were certain men who were defiled by a
human corpse, so that they could not keep the
Passover on that day; ...
:9 Then the LORD spoke to Moses, saying,
:10 Speak to the children of Israel, saying: "If
anyone of you or your posterity is unclean ...
he may still keep the Lord's Passover.
:11 On the fourteenth day of the second month, ..."
The New Testament confirms that it was this second Passover which required
John 18:28 Then they led Jesus from Caiaphas to the
Praetorium, and it was early morning. But
they themselves did not go into the Praetorium,
lest they should be defiled, but that they
might eat the Passover.
The second Passover was the time of the ritualistic killing of the
firstborn male animals. These animals included sheep, goats, cattle
Exod 13:1 Then the LORD spoke to Moses, saying,
:2 "Sanctify to Me all the firstborn, whatever
opens the womb among the children of Israel,
both of man and animal; it is Mine".
:11 And it shall be, when the LORD brings you into
the land of the Canaanites ...
:12 that you shall set apart (cause to pass over)
to the LORD all that open the womb, that is,
every firstling that comes from an animal which
you have; the males shall be the LORD's.
:15 ... Therefore I sacrifice to the LORD all males
that open the womb, but all the firstborn of
my sons I redeem.
Deut 16:2 Therefore you shall sacrifice the Passover to the
LORD your God, from the flock and the herd, ...
The exact timing for the start of the killing of the these firstborn
animals is implied in the narrative of the death of Jesus Christ.
Mark 15:33 Now when the sixth hour had come, there was
darkness over the whole land until the ninth
(Refer also Matt 27:45 and Luke 23:44.)
God would not have caused this darkness to come across the land if
between the 6th and 9th hours (midday to about 3.00pm) the Law had
required the slaughter of numerous firstborn animals. The inference
is that the killing of these firstborn animals always began about
3.00pm. (This was also the time when Christ died.)
The second Passover was a formalized ceremony.
2Chr 30:16 They stood in their place according to their
custom, according to the Law of Moses the man of
God; the priests sprinkled the blood received
from the hand of the Levites.
:17 For there were many in the assembly who had not
sanctified themselves; therefore the Levites
had charge of the slaughter of the Passover
lambs[animals] for everyone who was not clean,
to sanctify them to the LORD.
[ Translators have frequently incorrectly added the
word 'lamb' where it is not present in the original
Hebrew or Greek. ]