Harvest of Wheat at Pentecost, in Palestine
Source: Nav
Exodus 34:22
And you are to celebrate the Feast of Weeks with the firstfruits of the wheat harvest, and the Feast of Ingathering at the turn of the year.
Leviticus 23:15–17
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. / Bring two loaves of bread from your dwellings as a wave offering, each made from two-tenths of an ephah of fine flour, baked with leaven, as the firstfruits to the LORD.