TgO Ex23:16 :וְחַגָא דִחצָדָא בִכוּרֵי עוֹבָדָך דְתִזרַע בְחַקלָא‏ : the celebration of the reaping of the first fruits of your work that you sow in the field
See the entire entry for bikkūrīn, bikkūrayyā n.m.pl. first fruits