Ben Sira 43:7

7 From the moon is the sign of feasts, a light that decreaseth in her perfection.

Ben Sira 43:7 In-Context

5 Great is the Lord that made it; and at his commandment runneth hastily.
6 He made the moon also to serve in her season for a declaration of times, and a sign of the world.
7 From the moon is the sign of feasts, a light that decreaseth in her perfection.
8 The month is called after her name, increasing wonderfully in her changing, being an instrument of the armies above, shining in the firmament of heaven;
9 The beauty of heaven, the glory of the stars, an ornament giving light in the highest places of the Lord.
The King James Version is in the public domain.