From Jubilees XLIX. Remember the commandment which the Lord commanded thee concerning the passover, that thou shouldst celebrate it in its season on the fourteenth of the first month, that thou shouldst kill it before it is evening, and that they should eat it by night on the evening [note: Cf. Exod. xii. 6.] of the fifteenth from the time of the setting of the sun.
10. Let the children of Israel come and observe the passover on the day of its fixed time, on the fourteenth day of the first month, between the evenings,
[the ending evening of the 14th and beginning evening of the 15th]from the third part of the day to the third part of the night, for two portions of the day are given to the light, and a third part to the evening. [note: The Jews divided the night into three parts, or watches (6-10 p.m., 10 P.M.-2 a.m., 2-6 a.m.). The corresponding parts of the day would be 6-10 a.m., 10 a.m.-2 p.m., and 2 p.m.-6 p.m. Our text says the last of these was "given" to the evening.] 11. That is that which the Lord commanded thee that thou shouldst observe it between the evenings. 12. And it is not permissible to slay it during any period of the light, but during the period bordering on the evening, [note: This is an interpretation of the Biblical phrase "between the two evenings" (Exod. xii. 6; cf. R.V. marg.). This was interpreted by the Sadducees and Samaritans to mean between sunset and complete darkness (and may possibly have that meaning here), but by the Pharisees it was understood to refer to the earlier afternoon (3-6).] and let them eat it at the time of the evening until the third part of the night, [note:
i. e. any time between 6 p.m. and 6 a.m. The Rabbis limited the eating to midnight.] and whatever is leftover of all its flesh from the third part of the night and onwards, let them burn it with fire.
The bold above is my commentary
An example of when the Firstfruits burnt offering (the fat and blood) was supposed to be given from the Temple Scroll and comparison of the crucifixion and how Christ was a firstfruits sacrifice.