Rashi on Deuteronomy 26:3/רש"י על דברים כ״ו:ג׳

1אשר יהיה בימים ההם [AND THOU SHALT GO UNTO THE PRIEST] THAT SHALL BE IN THOSE DAYS — These apparently redundant words suggest: you have none else than the priest who lives in your days (you are only concerned with him) (cf. Sifrei Devarim 298:3; Rosh Hashanah 25b; see also Rashi on Deuteronomy 17:9).

2ואמרת אליו AND SAY UNTO HIM that you are not ungrateful (Sifrei Devarim 299:1).

3הגדתי היום I PROFESS THIS DAY — [the expression "this day" implies that the declaration is made] one once a year, but not twice a year [even when bringing from a different fruit or crop] (Sifrei Devarim 299:2).