Several studies have identified spirituality to impact the performance of Muslim managers. However, there are still pocket of complaints about nonconformity of managers to the principles of Islamic spirituality. The current study made efforts to provide novel ideas that have basis in the Qur’an and the Sunnah of Prophet Muhammad (SAW) to gain insights into experiential understanding of managers about Islamic spiritual culture (ISC), and it subsequently developed a substantive theory for moral modifications. This study used qualitative multi-approach. Understanding of 16 managers about ISC was sought through hermeneutic phenomenological approach, while grounded theory approach was applied for the analysis. The result of this study indicates that managers have common interest for standard service delivery through ISC. A substantive theory was developed from accounts of their experiences; through analytic procedures captured in this paper. Yet, a formal theory has not been developed for usage of the theory across various contexts.