The expansion of digital da'wah has increased the circulation and multimodal presentation of Arabic religious expressions in Indonesian online communication. This study examines how Arabic expressions are linguistically and multimodally recontextualized in Indonesian digital da'wah, with particular attention to the relationship between religious authority and communicative accessibility. Using qualitative multimodal content analysis, the study analyzes a purposively selected corpus of 15 publicly accessible da'wah videos published on YouTube, Instagram Reels, and TikTok between 2022 and 2024. The unit of analysis is a multimodal segment in which an Arabic expression occurs together with Indonesian verbal context and/or visual-auditory resources. The analysis distinguishes linguistic form, script representation, Arabic-Indonesian switching, and multimodal presentation rather than treating them as a single variety of 'popular Arabic.' The findings identify four recurring patterns: the use of formulaic and source-based Arabic expressions, orthographic recontextualization through Latin transliteration, Arabic-Indonesian switching, and the orchestration of subtitles, text overlays, repetition, prosody, and other visual-auditory resources. These patterns suggest an authority-accessibility alignment in which Arabic can index religious authority while Indonesian explanation and multimodal scaffolding can make messages more accessible. Because the study does not measure audience reception or learning outcomes, its pedagogical implications are framed as potential affordances for noticing and vocabulary exposure rather than demonstrated language acquisition.