Exodus 23:16

וחג הקציר AND THE FESTIVAL OF HARVEST — this is the Feast of Weeks, בכורי מעשיך which is the time for bringing the first-fruits, for the offering of the two loaves that were brought on the Feast of Weeks made it permissible for the first time during the year to use the new harvest of wheat for the meal offerings (Menachot 68b), and to bring the first fruits into the Temple, (Mishnah Bikkurim 1:3) for it is said, (Numbers 28:26) “And on the day of the first fruits etc., [בשבעתיכם on your weeks etc.]” (cf. Rashi on that verse). וחג האסף AND THE FESTIVAL OF THE INGATHERING — that is the Feast of Tabernacles. באספך את מעשיך WHEN THOU HAST GATHERED IN THY LABOURS — For during the whole summer-time the fruits are drying in the fields and about the Festival (הָחָג is a Talmudical term for the Feast of Tabernacles) they are gathered into the barns on account of the rain that is then due.

וְחַ֤ג הַקָּצִיר֙ בִּכּוּרֵ֣י מַעֲשֶׂ֔יךָ אֲשֶׁ֥ר תִּזְרַ֖ע בַּשָּׂדֶ֑ה וְחַ֤ג הָֽאָסִף֙ בְּצֵ֣את הַשָּׁנָ֔ה בְּאׇסְפְּךָ֥ אֶֽת־מַעֲשֶׂ֖יךָ מִן־הַשָּׂדֶֽה׃

and the feast of harvest, the firstfruits of thy labours, which thou hast sown in the field: and the feast of ingathering, which is at the end of the year, when thou hast gathered in thy labours out of the field.