The answer is in the verse, covenant with the peoples.
Rashi comments,
To show them that because they betrayed Me,
I nullified My covenant that I had formed with all the peoples concerning them.
For, on that condition I gave them the Torah,
that if they keep it, they will be free from the kingdoms,
that no nation or tongue shall rule over them.
Verse 11,
............knew this..........
the righteous among them eho kept My statutes understood.
Also,
I do not know what a wave sheaf is.
Thought you were talking about Sukkot and four kinds.
So will pass.
Yahshua the Messiah was the Firstfruits of the Resurrection Monday Evening.
1 Corinthians 15:20
But Christ has indeed been raised from the dead, the
firstfruits of those who have fallen asleep.
1 Corinthians 15:23
But each in turn:
Christ, the firstfruits; then, when he comes, those who belong to him.
John 6:35
Then Jesus declared, “
I am the bread of life. Whoever comes to me will never go hungry, and whoever believes in me will never be thirsty.
Exodus 23
The Three Annual Festivals
14 “Three times a year you are to celebrate a festival to me.
15 “Celebrate the Festival of Unleavened Bread; for seven days eat bread made without yeast, as I commanded you. Do this at the appointed time in the month of Aviv, for in that month you came out of Egypt.
“No one is to appear before me empty-handed.
16 “Celebrate the Festival of Harvest with the
firstfruits of the crops you sow in your field.
Three full days
Christ was hung on Friday the 13th, which was Preparation Day before the Sabbath began. The Sabbath and Passover began Friday evening at sundown. Christ was buried at about sundown on Friday. Unleavened Bread would last from Saturday evening to Sunday evening. First Fruits was offered on Monday. The women went to the tomb Tuesday morning after the First Fruits Offering.
Unleavened Bread Firstfruits Sheaf Wave
Leviticus 23:6 On the fifteenth day of that month the Lord’s Festival of
Unleavened Bread begins; for seven days you must eat bread made without yeast.
7 On the first day hold a sacred assembly and do no regular work. 8 For seven days present a food offering to the Lord. And on the seventh day hold a sacred assembly and do no regular work.’”
Offering the Firstfruits
9 The Lord said to Moses, 10 “Speak to the Israelites and say to them: ‘When you enter the land I am going to give you and you reap its harvest, bring to the priest a sheaf of the first grain you harvest. 11 He is to wave the sheaf before the Lord so it will be accepted on your behalf;
the priest is to wave it on the day after the Sabbath.
The day of Unleavened Bread is Sunday the 15th according to the biblical calendar, it is also a Sabbath Day of Rest, and no work was to be done on that day, such as attending a grave. Note that it says the day after that Sabbath.