question #1 Sahih al-Bukhari 1993, Book 30, Hadith 99 : What are the two types of fasting that are prohibited in Islam?

Two fasts and two kinds of sale are forbidden: fasting on the day of `Id ul Fitr and `Id-ul-Adha and the
kinds of sale called Mulamasa and Munabadha. (These two kinds of sale used to be practiced in the
days of Pre-Islamic period of ignorance; Mulamasa means when you touch something displayed for
sale you have to buy it; Munabadha means when the seller throws something to you, you have to buy
it.)