Exodus 23:16

16You are also to keep the Feast of Harvest23:16 That is, Shavuot, the late spring feast of pilgrimage to Jerusalem; it is also known as the Feast of Weeks(see Exodus 34:22) or the Feast of Pentecost(see Acts 2:1). with the firstfruits of the produce from what you sow in the field.

And keep the Feast of Ingathering23:16 That is, Sukkot, the autumn feast of pilgrimage to Jerusalem; it is later called the Feast of Tabernacles (or Booths or Shelters). at the end of the year, when you gather your produce from the field.