Haya (hiring) ya ƙunshi amfani da fa'idar abin da aka yi hayar sa. Dangane da ma'aikaci, haya tana nufin amfani da ƙoƙarinsa. Wajibi ne a cikin yin hayar ma'aikaci a bayyana aikin, lokacin aikin, albashin da kuma ƙoƙarin da zai yi. Dole ne a bayyana aikin don kada ya zama abin da ba a sani ba, domin haya bisa aikin da ba a sani ba haramun ce kuma ba ta inganta ba (Fasid). Haka kuma wajibi ne a bayyana lokacin aikin, kamar na kullum, na wata ko na shekara. Haka nan dole ne a bayyana albashin ma'aikacin. Ibn Mas'oud ya ce: Annabi ﷺ ya ce: "Idan ɗayanku ya ɗauki ma'aikaci, to ya sanar da shi albashinsa." Haka kuma wajibi ne a bayyana ƙoƙarin da ma'aikacin zai yi. Saboda haka ba a halatta a buƙaci ma'aikaci aikin da ya fi ƙarfinsa ba. Allah (SWT) ya ce:

Hiring involves utilising the benefit of the hired thing. With regard to the worker, hiring is utilising his effort. It is necessary in hiring a worker, to define the work, the period of work, the wage and the effort. The work has to be defined so as not to become unknown, because hiring based on unknown work is invalid (Fasid). It is also necessary to define the period of work, such as daily, monthly or yearly. Similarly, the wage of the worker has to be defined. Ibn Mas’oud said: The Prophet (pbuh) (pbuh) said: “If any one of you employed a worker then He has to inform Him of his wage.” It is also necessary to define the effort that the worker has to expend. Accordingly it is not allowed to demand of the worker work that is beyond his capacity. Allah (swt) said: