Ni sharti kwa mfanyabiashara kwamba kuwepo ijabu na kukubali kwa maneno yanayoashiria kila mmoja wao, au kwa kile kinachosimama mahali pa maneno, kama ishara za bubu. Maandishi yanachukuliwa kuwa sawa na usemi. Kuhusu biashara ya vitendo, kama mnunuzi anapochukua bidhaa na kulipa bei yake, kama vile kununua mkate, vitabu, stempu za posta na mfano wake, hilo linachunguzwa. Iwapo bidhaa ina bei inayojulikana sokoni bila kubishana humo, basi kitendo hicho kinaashiria ijabu na kukubali, hivyo kinachukuliwa kuwa biashara, na ndicho wanachokiita mafuqaha biashara ya kuchukuana kwa pamoja. Lakini iwapo bei ya bidhaa haijulikani sokoni na inahitaji kubishana, basi biashara ya kuchukuana kwa pamoja si sahihi humo, kwa sababu kitendo hakiashirii ijabu na kukubali, kwani mizozo inaweza kuingia humo. Hili ni kinyume na kile miamala inapaswa kuwa, kwani miamala lazima iwe ya namna inayozuia mizozo. Kwa hiyo biashara hii ya kuchukuana kwa pamoja haichukuliwi kuwa biashara kutokana na kukosekana kwa kauli wazi juu ya ijabu na kukubali. Kwa mujibu wa hayo, inafafanuliwa kuwa, kwa kuwa ijabu na kukubali ni sharti la uhalali wa biashara, ni lazima vitokee kwa maneno yanayoviashiria au kwa ishara inayoviashiria kwa dalili ya uhakika isiyobeba (uwezekano wowote) isipokuwa hivyo viwili pamoja, na kwa kutokuwepo mzozo.
It is a condition for the trader that there exists offer and acceptance by words indicating each one of them or what stands in the place of words like the signs of the mute person. Writing is considered from speech. As for practical trade like where the buyer takes the good and pays its price like buying bread, books, postal stamps and the like, it is looked into. If it is a good with a well-known price in the market without bargaining therein then the action indicates offer and acceptance so it is considered trade and it is what the fuqaha term trade of mutual taking. Whereas if the price of the good is not defined in the market and needs bargaining, then the trade of mutual taking is not valid therein because the action does not indicate offer and acceptance as it is possible for disputes to enter therein. This is opposite to what transactions must be since transactions must be of a form preventing disputes. So this trade of mutual taking is not considered trading due to the absence of the clear statement upon offer and acceptance. Accordingly this clarifies that since offer and acceptance are conditions of the validity of the trade, it is necessary for them to occur by words indicating them or an sign indicating them with a decisive indication not carrying (any possibility) other than the two together with the absence of dispute.
Biashara inakamilika kwa vitu visivyopimwa, visivyopimwa kwa uzito wala visivyohesabiwa mara tu baada ya kumaliza mkataba, na kuchukua umiliki si sharti la kukamilisha biashara humo. Iwapo kitu kilichouzwa kitaharibika kabla ya kuchukuliwa, hilo ni jukumu la mnunuzi na si jukumu la muuzaji, kama vile katika ununuzi wa nyumba, mnyama, gari na vitu vingine vinavyofanana navyo, ambavyo havipimwi, havipimwi kwa uzito wala havihesabiwi. Hii ni kwa sababu ya kauli ya Mtume ﷺ:
Trade is accomplished in other that what is measured, weighed or counted merely upon finishing the contract, and taking possession is not a condition to conclude the trade therein. If the sold thing spoils before its possession is taken, this is in the responsibility of the buyer and not the responsibility of the seller like the buying of the house, animal, car and what is similar to that which is not measured, weighed or counted. This is because of the Messenger (saw) saying: