Sirach 18:10

10 As a drop of water unto the sea, and a gravelstone in comparison of the sand; so are a thousand years to the days of eternity.

Sirach 18:10 In-Context

8 What is man, and whereto serveth he? what is his good, and what is his evil?
9 The number of a man's days at the most are an hundred years.
10 As a drop of water unto the sea, and a gravelstone in comparison of the sand; so are a thousand years to the days of eternity.
11 Therefore is God patient with them, and poureth forth his mercy upon them.
12 He saw and perceived their end to be evil; therefore he multiplied his compassion.

The Brenton translation of the Septuagint is in the public domain.