Rashi on Exodus 34:22/רש"י על שמות ל״ד:כ״ב

1בכורי קציר חטים [THE FESTIVAL] OF THE FIRST OF THE WHEAT HARVEST — It is so called because on it you offer the two loaves of wheat (Leviticus 23:17).

2בכורי OF THE FIRST [OF THE WHEAT HARVEST] — It is so called because it (the offering of the two loaves) is the first meal offering which is brought in the Temple of the new wheat crop; for the meal offering of the Omer which had already been brought on Passover was of barley (Menachot 84a).

3וחג האסיף AND THE FESTIVAL OF INGATHERING — the festival that falls at the time of the year when you gather in thy produce from the field into the barns. The word אסף here means bringing in (and not, collecting), as (Deuteronomy 22:2) “thou shalt gather it (ואספתו) into thine house” (cf. Rashi on Exodus 23:16 and on Genesis 49:29).

4תקופת השנה lit., [THE FESTIVAL …] THE YEARS CIRCUIT — i. e. the festival at the coming round of the year — at the beginning of the coming (the new) year.

5תקופת is a term denoting going round.