In the Old Testament, the Feast of Firstfruits was kept the day after the weekly sabbath (which came in the days after Passover, Leviticus 23:15).  

The Firstfruits of the barley harvest ripened at the time of Passover (Exodus 9:31).

The priest would wave (Lev 23:10-15) the sheaf of barley before YHWH, presenting it to Him as the Firstfruits of the barley grain harvest.  The people were not allowed to eat any of this new barley grain until it had been first presented to YHWH …

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