Through your monitor
Believe it or not, the type of “monitor” Jay is likely referring to are high-grade speakers for producers and engineers.
The messenger of God (Jay himself) is coming right through your monitor/speakers for you to hear. This is shown by the previous line which translates to “…the Messenger of God, may He be glorious and exalted.” So he’s basically saying “the Messenger of God through your monitor.”
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