Katika aina fulani za ajira, inatosha kutaja aina ya kazi tu iliyoajiriwa, kama vile kushona, au kuendesha gari hadi mahali palipotajwa, bila kutaja muda. Katika aina nyingine za ajira, inatosha kutaja muda wa ajira tu, bila kutaja kiasi cha kazi. Mfano wa hili ni kumwajiri mtu kwa mwezi mmoja ili achimbe kisima au mfereji.

In some types of hiring, it is necessary to mention only the type of work hired for, such as sewing, or driving a car to a named place, without mentioning a duration. In other types of hiring, it is necessary to mention only the duration of hiring, without mentioning the quantity of work. An example of this is to hire somebody for a month to dig a well or a canal,

ambayo haihitaji kiasi kilichobainishwa, bali tu kwamba uchimbaji ufanyike ndani ya mwezi huu, iwe kidogo au kingi. Katika aina nyingine, muda na aina ya kazi lazima vitajwe, kama vile kujenga nyumba, kujenga kiwanda cha kusafisha mafuta na kadhalika. Kwa hiyo kila kazi inayohitaji kubainishwa kwa muda, muda huo lazima utajwe,

which does not need a quantity defined, only that the digging should be done during this month, whether little or much. In other types, the duration and the type of work have to be mentioned, such as building a house, constructing an oil refinery and the like. So every work that needs the time period to be defined, the time period has to be mentioned,

kwa sababu asili ya ajira lazima ijulikane. Kutotaja muda wa ajira katika baadhi ya kazi hufanya ajira kuwa isiyojulikana, na ajira isiyojulikana huwa batili. Ikiwa ajira ilifungwa kwa muda fulani, kama mwezi mmoja au mwaka mmoja, basi hakuna kati ya pande mbili anayeruhusiwa kuvunja mkataba wa ajira hadi muda huo umalizike. Ikiwa mfanyakazi aliajiriwa kwa muda unaorudiwa, kama dinari ishirini kila mwezi, basi lazima ashiriki katika kazi iliyokubaliwa kila mwezi, na muda lazima utajwe katika mkataba wa ajira. Si lazima kwamba kipindi cha ajira (yaani mwezi) kianze mara baada ya mkataba. Kwa hiyo inaruhusiwa kumwajiri mtu mwezi wa Muharram afanye kazi mwezi wa Rajab. Ikiwa muda ulitajwa katika mkataba au ilikuwa ni lazima kuutaja ili kuondoa kutokuwa na uhakika, basi kipindi hicho lazima kibainishwe kwa vipimo vya wakati kama dakika, saa, wiki, miezi au miaka.

because the nature of the hiring has to be known. Not mentioning the time duration in some works makes the hiring unknown, and if the hiring is unknown it becomes invalid. If the hiring was contracted over a certain time period such as one month or one year, then no one of the two parties is allowed to break the contract of hiring until the time period has ended. If a worker was hired for a repeated time duration, such as twenty dinars monthly, then he has to be involved in the contracted work every month and the duration must be mentioned in the hiring contract. It is not necessary that the period of hiring (i.e. the month) has to start immediately after the contract. So it is allowed to hire a person in Muharram to work in Rajab. If the duration was mentioned in the contract or it was necessary to mention it so as to remove uncertainty, then this time period has to be defined in time units such as minutes, hours, weeks, months or years.