Verse 10 reiterates what we saw in Exodus 23 that the Feast of Weeks is kept to the LORD. It wasn’t just a festive occasion, but a time He set apart for His people to remember Him. The feasts are about Him.
Part of Pentecost’s uniqueness is its emphasis on time. It is the only holy day arrived at by counting. In the Hebrew Scriptures, its primary name is the Feast of Weeks. It is called that five times (Exodus 34:22; Numbers 28:26; Deuteronomy 16:10, 16; II Chronicles 8:13), and the Feast of Harvest once. In the New Testament, Pentekostos is a Greek word that means “count fifty.” Thus, it is a feast that cannot take place until the designated number of weeks, or the number of days, has been fulfilled. The feast is a culmination of a distinctive span of time.