In digital da'wah, the strategic use of multiple languages has become increasingly significant for conveying religious messages effectively. However, previous studies have primarily emphasized the structural classification of code-mixing, while its communicative functions and sociolinguistic significance in virtual religious discourse remain underexplored. This study aims to analyze code-mixing practices in Gus Baha's virtual da'wah by examining their linguistic forms and communicative functions from a sociolinguistic perspective. This study employed a qualitative descriptive-interpretive approach. The data consisted of verbal utterances extracted from four Gus Baha da'wah videos published on YouTube. The data were transcribed verbatim and collected through observation, note-taking, and recording techniques. They were subsequently analyzed using an interactive model involving data reduction, categorization, contextual analysis, and interpretation. The findings reveal that word-level code-mixing is the predominant linguistic form. In terms of variation, internal code-mixing involving Javanese occurs most frequently, while external code-mixing involving Arabic is mainly employed to express religious concepts and scriptural references. Functionally, code-mixing serves as a strategy for emphasis, clarification, religious expression, and the construction of social intimacy between the preacher and the audience. These findings demonstrate that code-mixing is systematically employed as an adaptive communicative strategy to enhance the effectiveness of digital da'wah. The study contributes to sociolinguistic scholarship by extending the understanding of code-mixing beyond its structural forms to its communicative functions in digital religious discourse and provides insights for developing more audience-oriented communication strategies in contemporary online da'wah.
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