The meaning of Hay in the Bible
(From Easton's Bible Dictionary)

properly so called, was not in use among the Hebrews; straw was used instead. They cut the grass green as it was needed. The word rendered "hay" in Proverbs 27:25 means the first shoots of the grass. In Isaiah 15:6 the Revised Version has correctly "grass," where the Authorized Version has "hay."

See more on the meaning of Hay in the Bible:
Hay {International Standard Bible Encyclopedia}

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