Exodus 23:16-18

Young's Literal Translation

¹⁶ and the Feast of Harvest, the first fruits of thy works which thou sowest in the field; and the Feast of the In-Gathering, in the outgoing of the year, in thy gathering thy works out of the field.

¹⁷ `Three times in a year do all thy males appear before the face of the Lord Jehovah.

¹⁸ `Thou dost not sacrifice on a fermented thing the blood of My sacrifice, and the fat of My festival doth not remain till morning;