The study of KH. Salim Ma'ruf thought about buying and selling is important to do because sometimes his thought is in contrast to other scholars opinion. For example, KH. Salim Ma'ruf said that buying and selling done by a drunk person is valid/legal. However, if it is done by children under the permission of the guardians, according to KH.Salim Maruf, is not valid/legal. KH. Salim Ma'ruf also found that buying and selling to people whose treasure is doubtful is makruh. In addition, he also

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... d that buying and selling sacrificial meat is haram, bay 'al-'urbun, bay' munabadzah and bay 'mulamasah, bay'ataini fi bay'atin, bay 'malaqih. KH. Salim Maruf did not give the legal proposition on each of his thought published in the book of Risalah Mu'amalah while the law is said to be invalid or false is determined from the aspect of legal proposition, therefore, it is necessary to study and search of the arguments used in book.