Exodus Exodus 23:14-33
The Book of the Covenant does not end with a law. It ends with a journey toward the land and the One who carries the Name into it: three pilgrim-feasts kept before the face of the Lord, and an Angel in whom God's own Name dwells. The same verb sends the Angel, the terror, and the hornet before Israel's face; the same word frames the Name within the Angel and the plague driven from Israel's midst. At the apex stands an Angel who will not bear transgression because the Name is within him — the prerogative the rest of the canon reserves for YHWH alone, carried 'little by little' into a land never fully conquered, and finally given to the Son who is ranked above the angels.
Leviticus Lev 23:15–22
The Torah commands one feast by counting: seven sabbaths plus one day, from the wave-sheaf of Passover week to the leavened loaves of the fiftieth day. The count matters. The leaven matters. When Acts 2 dates the outpouring of the Spirit to this feast, every detail is already in the book of Leviticus.