Devarim 16:9-10

Orthodox Jewish Bible

⁹ Shivah shavu’ot (seven weeks) shalt thou number unto thee; begin to number the shivah shavu’ot from such time as thou begin to put the sickle to the standing crop.

¹⁰ And thou shalt observe Chag Shavuos unto Hashem Eloheicha by giving a terumah (freewill offering) of thine hand, which thou shalt give unto Hashem Eloheicha, according as Hashem Eloheicha hath blessed thee: