The Feast of Pentecost: Held Fiftieth Day After offering First Sheaf of Barley

From the day after the Sabbath, the day you brought the sheaf of the wave offering, you are to count off seven full weeks.

You shall count off fifty days until the day after the seventh Sabbath, and then present an offering of new grain to the LORD.

You are to count off seven weeks from the time you first put the sickle to the standing grain.