Exodus 23:16

Thou shalt also keep the festival of the ingathering of the first fruits of thy labours employed in sowing thy field; and the festival of completion at the end of the year, when thou hast gathered in thy labours from the field.

And thou shalt keep the feast of the harvest of first-fruits of thy labours, whatsoever thou shalt have sown in thy field, and the feast of completion at the end of the year in the gathering in of thy fruits out of thy field.