I see that you've inserted "new grains" into Deut 16:8 yourself. This is your interpretation, and Scripture makes no mention of there being a difference between an "old" or "new" produce when it comes to the making of unleavened bread during the Festival of Unleavened bread. Neither Deuteronomy nor Leviticus states that the Unleavened bread has to always be made with "new grain" during the Festival of Unleavened bread; all they both state is that unleavened bread is to be eaten.Leviticus 23:14 And ye shall eat neither (the new grains) bread, nor parched corn, nor green ears, until the selfsame day that ye have brought an (first fruits) offering unto your God: it shall be a statute for ever throughout your generations in all your dwellings.
Deuteronomy 16:3 Thou shalt eat no leavened bread with it; seven days (Nisan 15. 16, 17, 18, 19, 20, 21) shalt thou eat unleavened bread therewith…
Deuteronomy 16:8 Six days (16, 17, 18, 19, 20, 21) thou shalt eat (the new grain) unleavened bread…
On Nisan 15 Jews ate unleavened bread (barely loaf) made from the ‘old grain’. Beginning from Nisan 16–Nisan 21.
Jews ate unleavened bread (barely loaf) from the ‘new grain’ for six days. This way works consistently when the first fruits offering was presented at the beginning of Nisan 16th regardless to whatever week day it fell upon for each particular year.
If the weekly Sabbath landed on a Nisan 19, however, and the First fruits offering followed on Nisan 20 on a particular year, Jews would have ate unleavened bread (barley loaf) from the ‘old grain’ for five days on Nisan 15, 16, 17, 18, 19 and unleavened bread (barely loaf) from the ‘new grain’ for two days being Nisan 20 and Nisan 21. The numbers of days for the eating of unleavened bread from the old produce or the new produce would vary differently year after year if the first fruits offering were modelled after the weekly Sabbath occurring with in the Passover period. Deuteronomy 16:3 says ‘seven days’ and 16:8 says’ six days’ when unleavened bread was to be eaten. The only reconciliation here for each consecutive year was that no new grain could be eaten until after the ‘first fruits offering was presented on the beginning of Nisan 16.
I really don't care what the Rabbinics have to say. Their traditions don't supersede what Scripture states, and that is that the Sheaf of the Firstfruits offering happens "on the day after the Sabbath". Scripture couldn't be more clear, nor the Rabbinics more wrong.If the first fruits offering occurred on a weekly Sabbath the offering would take precedence over the Sabbath. The probability of the ‘Sheaf Offering Dedication’ (Abib/Nisan 16th) occurring on a Sabbath day was very tangible as revealed from within the AD 300 rabbinical writings such as the Tosefta (tractrate 10:23). Please See;
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Once more, there is a debate on when exactly the Passover sacrifice was to be eaten. Is it to be eaten during the initial night of Nisan/Abib 14th, that is, just after it goes dark; or just before the start of Nisan/Abib 15th? Exodus 12:6 states: and you shall keep it until the fourteenth day of this month, when the whole assembly of the congregation of Israel shall kill their lambs between the two evenings, continuing on in Exodus 12:8 They shall eat the flesh that night, roasted on the fire; with unleavened bread and bitter herbs they shall eat it indicating to me that the Passover sacrifice is to be eaten just after Nisan/Abib 14th starts. And this also states that the Passover meal is to be eaten with unleavened bread as well.Luke 22:14 And when the hour was come, he sat down, and the twelve apostles with him.
* The word ‘hour’ here is in reference to the time of day near the end of Nisan 14 when Jews normally gathered for the beginning of Passover. No where in the entire bible is any significance given specifically to an ‘hour’ on Nisan 13 having any merit to the period of Passover.
* Many Traditionalists perceive the ‘Last Supper’ occurring on the nightly beginning of Nisan 14. If this had been the case, the meal then, would have been an anticipatory meal eaten 24 hours ahead of the actual designated time. That would have been a meal eaten with leavened bread puffed up with yeast and haughtiness that Saul warned us about. Our Lord would have used ‘unleavened bread’ only at the designated time on the beginning of Nisan 15 to represent His body which was pure and clean of any sin or wrong doing. Subsequently, a resurrection occurring on Nisan 16 was highly unlikely where the prelude of Passion events must have occurred in synchronization to Hebrew law.
I can't see anything that states that the Passover is to be eaten on the 15th of Nisan. When it comes to Passover and the consumption of it, only the date of the 14th is mentioned.
Regardless of all this, whatever interpretation you want to try and give to when the Passover is to be eaten, when Unleavened Bread starts, or when firstfruits is, the main point is that the Messiah was crucified on a Friday, as witnessed by all the eyewitness accounts, therefore rendering a seventh-day Sabbath resurrection impossible.