The etymology of the word chapel comes from Old French chapele, from medieval Latin cappella, diminutive of cappa ‘cap or cape.’ The word chaplain means custodian of the cloak, or someone who inherits and preserves the sacred teaching of a spiritual tradition.           

                   Ḥakīm is the closest word in Islamic tradition that describes the word chaplain​

In Arabic, Ḥakīm means a "wise person." Ḥakīm was also used more generally to refer to polymath scholars who were knowledgeable in healing, theology, psychology, and philosophy such as Ibn Sīnā (Avicenna). ​Ibn Sīnā argues that spiritual wellness requires that the connection between the body and soul be strong enough to ensure the soul's individuation but weak enough to allow for its immortality. According to Ibn Sīnā, this process of perception and abstraction of meanings is the nexus of the soul and body, for the material body may only perceive material objects, while the immaterial soul may only receive the immaterial, and makes meanings of the world.  

Prophet Muhammad (sa) said: "Each of you is a caretaker and each of you should provide quality care for whom he/she cares for. The father is a caretaker of his household and he should provide quality care for his household. The mother is a caretaker for her children and she should provide quality care for her children. An employee is a caretaker of customers and he /she should provide quality care for his/her customers. A leader is a caretaker of people, and he/she should provide quality care for the people whom he/she leads,"

The quality of care that Prophet Muhammad described includes the physical, the mental, and the spiritual. Physicians care for the physical bodies, psychologists care for mental health, and Ḥakīms care for the souls. 
       
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                                                   Become a Ḥakīm: Mercy for the world!