"On the day of the first fruits, when you offer up a new meal offering to G‑d . . . you shall bring a burnt offering for a pleasant fragrance"Numbers 28:26-27.

On the fiftieth day after the offering of the omer sacrifice on the sixteenth of Nissan, we are commanded to bring a special offering in addition [to the regular daily sacrifices] in the Holy Temple—the Atzeret [Shavuot] Offering.