Final answer:
The exact number of disciples stood with John the day after testifying of the Son of God is not given in the provided passages or the broader New Testament context.
Step-by-step explanation:
The number of disciples stood with John the day after testifying of the Son of God is not explicitly stated in the passages provided. The New Testament mentions various instances where disciples and followers of Jesus were present with John or other apostles, but to pinpoint the exact number present on a particular day after a specific event requires further context from the Scriptures. Passages like the calling of Levi, the scene with Jesus and the tax collectors, and encounters with the risen Christ involve various combinations of disciples and apostles, reflecting a broader theme of discipleship and faith rather than providing a numerical answer to this specific question.