The Old Covenant mentions two grain offerings.
Lev 23: v9. And Yahweh spake unto Moses, saying,
V10. Speak unto the children of Israel, and say unto them, When ye be come into the land which I give unto you, and shall reap the harvest thereof, then ye shall bring a sheaf (omer/handful) of the firstfruits (best part/chief) of your harvest (barley) unto the priest
V11. And he shall wave the sheaf before Yahweh, to be accepted for you: on the morrow (next day) after the Sabbath (weekly) the priest shall wave it (1st day of week Sunday).
V12. And ye shall offer that day when ye wave the sheaf (future resurrected YahwehShua) a he lamb (future defilement of Messiah and his human name) without blemish of the first year for a burnt offering unto Yahweh.
V13. And the meat (grain) offering thereof [shall be] two tenth deals of fine flour mingled with oil, an offering made by fire unto Yahweh [for] a sweet savour: and the drink offering thereof [shall be] of wine (future defilement of Messiah’s blood), the fourth [part] of an hin.
V14. And ye shall eat neither bread, nor parched corn, nor green ears, until the selfsame day that ye have brought an offering unto Yahweh: [it shall be] a statute for ever (a period of time in Old Covenant) throughout your generations in all your dwellings.
V15. And ye shall (start) count unto you from the morrow (next day) after the (weekly) Sabbath, from the day (within the days of Unleavened Bread) that ye brought the sheaf of the wave offering; seven (weekly) Sabbaths shall be complete:
V16. Even unto the morrow after the seventh sabbath shall ye number fifty days (stop count); and ye shall offer a new meat (grain) offering unto Yahweh.
V17. Ye shall bring out of your habitations two wave loaves (future 2 Witnesses) of two tenth deals: they shall be of fine flour (best of the wheat harvest/144k Saints); they shall be baken with leaven (like bread of the Last Supper); [they are] the firstfruits (best of the 144 thousand Saints) unto Yahweh.
V20. And the priest shall wave them with the bread of the firstfruits [for] a wave offering before Yahweh, with the two lambs (they are both killed like Messiah): they shall be holy to Yahweh for the priest.
V21. And ye shall proclaim on the selfsame day (Pentecost when the Ten Commandments were given at Mount Sinai and when the 12 apostles received the Holy Spirit at the start of the New Covenant), [that] it may be an holy convocation (set apart Holy Assembly and one of the annual Sabbaths) unto you: ye shall do no servile work (usual occupation or toil) [therein: it shall be] a statute for ever in all your dwellings throughout your generations.
V22. And when ye reap the harvest of your land, thou shalt not make clean riddance of the corners of thy field when thou reapest, neither shalt thou gather any gleaning of thy harvest: thou shalt leave them unto the poor, and to the stranger: I [am] Yahweh your Creator.
When our Creator finished his 3 & 1/2 year ministry he was killed Wednesday at 3 pm during the daylight portion of the 14th of Abib (The same time the Passover lambs were being slaughtered on the preparation day, then just prior to sunset was laid in the tomb just prior to 15th (annual Sabbath Feast of Unleavened Bread day one). He was resurrected (72 hours later) just prior to sunset on Saturday night the end of the weekly Sabbath. He ascended to the Father as the Perfect Wave Sheaf (YahwehShua) on Sunday approximately 3 & 1/2 days after his death.
Jhn 20: v17. YahwehShua saith unto her, Touch me not; for I am not yet ascended to my Father: but go to my brethren, and say unto them, I ascend (1st day of the week) unto my Father, and your Father; and [to] my Father Yahweh, and your Father Yahweh.
The two witnesses, who likely are Elijah and Moses that have their physical life extended, will testify against the world for 3 and 1/2 years to complete Messiah's ministry.
They will be killed by the false Messiah at the direction of the adversary and will lay physically dead three and a half days, and then they will be resurrected into spiritual bodies and ascend to YahwehShua at the Seventh Trump (Feast of Shouting) as part of the 144 thousand Saints.
Everyone who is not a part of 144,000 will have their physical life extended into the millennium (Feast of Tabernacles) and get to know our Creator perfectly. All will get their chance to be in the family as part of the innumerable multitude when the adversary is let out the first hundred years of the Last Great Day. Overcoming the adversary is what allows the growth of Messiah in you which is hard work and is an integral part of salvation or a chance to be in the family.
Those who fail will nevertheless get the free gift of life or reconciliation (not salvation) and live outside the family eternally.
HalleluYahwehShua!