There are never less than twenty-one blasts in the Temple and never more than forty-eight. There are never less than two harps, nor more than six. There are never less than two flutes, nor more than twelve. On twelve days in the year the flute was played before the altar: At the slaughtering of the first pesah, At the killing of the second pesah, On the first festival day of Pesah, On the festival day of Atzeret (Shavuot), And on the eight days of Sukkot. And they did not play on a pipe [abuv] of bronze but on a pipe of reed, because its tune is sweeter. Nor was anything but a single pipe used for closing a tune, because it makes a pleasant finale.