Related for Menachot 10:6
הָעֹמֶר הָיָה מַתִּיר בַּמְּדִינָה, וּשְׁתֵּי הַלֶּחֶם בַּמִּקְדָּשׁ. אֵין מְבִיאִין מְנָחוֹת וּבִכּוּרִים וּמִנְחַת בְּהֵמָה קֹדֶם לָעֹמֶר. וְאִם הֵבִיא, פָּסוּל. קֹדֶם לִשְׁתֵּי הַלֶּחֶם, לֹא יָבִיא. וְאִם הֵבִיא, כָּשֵׁר:
The <i>omer</i> permitted [new grain] in the rest of the country and the two loaves [offered on Shavuot, permitted new grain] in the Temple. Grain offerings and first fruits [from the new produce] could not be brought before the <i>omer</i>, and if they were, they were invalid. They should not be brought before the two loaves, but if they were they are still valid.
Tosefta Bikkurim
We do not bring Bikkurim (first fruits) before Shavuot, and if they are [nonetheless] brought, we must wait until Shavuot arrives and [only then] recite the declaration [beginning with "My father was a wandering Aramean..." (Deut. 26:5-10)].
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