The day after Passover, is called “First Fruits”. In the year Jesus died this fell on the Sunday. On this day by God's commandment the Jews are to bring to the Temple the first sheaf of the first harvest and give it as a gift offering to the Lord to be waved before him in the Temple. (See our Old Testament Reading Today). The Jewish Historian Josephus wrote:

On the second day of unleavened bread, that is to say the sixteenth, our people partake of the crops which they have reaped and which have not been touched till then, and esteeming it right first to do homage to God, to whom they owe the abundance of these gifts, they offer to him the first-fruits of the barley in the following way. After parching and crushing the little sheaf of ears and purifying the barley for grinding, they bring to the altar an assaron (The omer or homer, a Hebrew measure of five pints.) for God, and, having flung a handful thereof on the altar, they leave the rest for the use of the priests. Thereafter all are permitted, publicly or individually, to begin harvest. - Josephus

1 Corinthians 15:20 makes the connection with Jesus crystal clear:

But in fact Christ has been raised from the dead, the first fruits of those who have died.- 1 Corinthians 15:20.

Three truths about Easter and the Jewish Feasts:

1. Jesus dies at the same time as the Passover lambs.
2. Day One - Passover – The Great Sabbath - Jesus’ body lies without corruption and rests.
3. Day Two – Sabbath - Jesus is dead, his body lies without corruption and rests.
4. Day Three – The Feast of First-fruits – Jesus’ resurrection.

Christ beat death, and his broken beaten body did not decay - it healed. The first-fruits of those who have died – first of many millions. The timing is No coincidence. The last day of The Feast of Unleavened Bread is the anniversary of the day the Red Sea Parted before Moses and the Hebrews. It is the day many of them believe that the Messiah will appear. As the Jews say:

"Next year in Jerusalem"