Exodus 34:21-23

Young's Literal Translation

²¹ `Six days thou dost work, and on the seventh day thou dost rest; in ploughing-time and in harvest thou dost rest.

²² `And a feast of weeks thou dost observe for thyself; first-fruits of wheat-harvest; and the feast of in-gathering, at the revolution of the year.

²³ `Three times in a year do all thy males appear before the Lord Jehovah, God of Israel;