Sirach 32:3-5

Revised Standard Version

³ Speak, you who are older, for it is fitting that you should,
    but with accurate knowledge, and do not interrupt the music.
⁴ Where there is entertainment, do not pour out talk;
    do not display your cleverness out of season.
⁵ A ruby seal in a setting of gold
    is a concert of music at a banquet of wine.