וּסְפַרְתֶּ֤ם לָכֶם֙ מִמָּחֳרַ֣ת הַשַּׁבָּ֔ת מִיּוֹם֙ הֲבִ֣יאֲכֶ֔ם אֶת־עֹ֖מֶר הַתְּנוּפָ֑ה שֶׁ֥בַע שַׁבָּת֖וֹת תְּמִימֹ֥ת תִּהְיֶֽינָה׃
Kamu harus menghitung sendiri, mulai dari hari sesudah hari perhentian (hari raya pertama), yaitu sejak hari kamu membawa omer persembahan unjukan itu: harus genap tujuh minggu.
Bartenura
שלא לקיים דברי האומרים עצרת אחר שבת – for the Sadducees would say that Atzeret/Shavuot always [occurs] after Shabbat, as it is written (Leviticus 23:15): “And from [the day on which you bring the sheaf of elevation offering] – the day after the sabbath, [you shall count off seven weeks. They must be complete],” and they say that “the day after the sabbath” in the beginning [of Passover] and if so, Atzeret/Shavuot will always fall on Sunday.
Chizkuni
וספרת לך שבע שבתות שנים, ”you are to count for yourself 7 seven year cycles, seven times;” seeing that the Torah speaks of counting in the singular mode, i.e. by a single person, it addresses the High Court which will proclaim the start of the Jubilee year. There is no need to recite a benediction as is the case in Leviticus 23,15 when counting the omer; there two separate counts had been mentioned, days and weeks. This had been repeated also in Deuteronomy 16,9. One was meant for the individuals and one for the High Court.
Tur HaArokh
מהחל חרמש בקמה, “when the sickle is first out to the standing grain.” The precise date when this occurs has already been spelled out in Leviticus 23,15 as being the 16th of Nissan.