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Leviticus 23:15-17
'And you shall count for yourselves from the day after the Sabbath, from the day that you brought the sheaf of the wave offering: seven Sabbaths shall be completed. Count fifty days to the day after the seventh Sabbath; then you shall offer a new grain offering to the LORD. You shall bring from your dwellings two wave loaves of two-tenths of an ephah. They shall be of fine flour; they shall be baked with leaven. They are the firstfruits to the LORD.
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Leviticus 2:1-2
"When anyone offers a grain offering to the LORD, his offering shall be of fine flour. And he shall pour oil on it, and put frankincense on it. He shall bring it to Aaron's sons, the priests, one of whom shall take from it his handful of fine flour and oil with all the frankincense. And the priest shall burn it as a memorial on the altar, an offering made by fire, a sweet aroma to the LORD
Bread flour must be ground;
Therefore he does not thresh it forever,
Break it with his cartwheel,
Or crush it with his horsemen.