What is the origin of the phrase, "Eat, drink and be merry, for tomorrow you may die"?

"Eat, drink, and be merry, for tomorrow we die" is a conflation of two biblical sayings, Ecclesiastes 8:15, ‘Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be merry’, and Isaiah 22:13, ‘Let us eat and drink; for to morrow we shall die.’ There are a number of humorous variants.

http://www.encyclopedia.com/doc/1O214-eat.html

http://net.bible.org/verse.php?book=Ecc&chapter=8&verse=15

It should be noted that the phrase is also found in the Book of Mormon (2 Nephi 28:7) "Yea, and there shall be many which shall say: Eat, drink, and be merry, for tomorrow we die; and it shall be well with us."

https://www.lds.org/scriptures/bofm/2-ne/28.7