The Islamic Banking (IB) sector in Malaysia has gone beyond three decades. Various challenges and obstacles need to be pursued for development. Among it includes the aspect of the knowledge delivery of IB employees. The knowledge delivery of IB employees in Malaysia currently faces a significant gap. Research has shown that there has been a relatively few number of studies conducted on accomplishment of knowledge delivery of IB employees. This study aims to test and discuss factors that influence the accomplishment of knowledge delivery of IB employees in Malaysia. In this context, knowledge delivery of IB employees is defined as the execution of IB literacy, ethics, and knowledge enhancement by IB employees. The questionnaires were distributed to 405 IB employees across Malaysia. The constructs and items used in the questionnaire were derived from basic guidelines provided in the literature review, al-Quran, and al-Hadith. The partial least squares structural equation modelling (PLS-SEM) method was the main statistical technique employed in this study. Analysis of the responses demonstrated that IB literacy affected the accomplishment on knowledge delivery of IB employees most significantly compared to Islamic marketing ethics and IB knowledge enhancement. The result also indicates that Islamic wellbeing attributes have significant effect on knowledge delivery of IB employees, and partial mediating effect on the relationship between each independent variables of IB literacy, Islamic marketing ethics, and IB knowledge enhancement with the accomplishment on knowledge delivery of IB employees. On this basis, it is recommended that Islamic Banks use IB literacy, Islamic marketing ethics, and IB knowledge enhancement as key factors in accomplishing the knowledge delivery of IB employees. Further research is needed to identify other factors that could strengthen the accomplishment on knowledge delivery of IB employees.