Shavuot is also known as the festival of ‘Weeks’. This joyous Jewish observance marks the time that the Jews received the Torah (the five books of Moses) on Mount Sinai and it is considered a highly important historical event. Prayers are said on Shavuot (especially at dawn) to thank God for the Torah and for his law. Some people also spend the first night of Shavuot studying the Torah. During Shavuot, synagogues are decorated with flowers and plants to recall the flowers of Mount SInai.