Exodus 16:34-36

Young's Literal Translation

³⁴ as Jehovah hath given commandment unto Moses, so doth Aaron let it rest before the Testimony, for a charge.

³⁵ And the sons of Israel have eaten the manna forty years, until their coming in unto the land to be inhabited; the manna they have eaten till their coming in unto the extremity of the land of Canaan.

³⁶ and the omer is a tenth of the ephah.