John says that 'after eight days' the disciples are again inside, this time with Thomas present, when Jesus appears among them despite the shut doors.
Jesus in Context
After Eight Days: Ancient Inclusive Reckoning
John's 'after eight days' reflects ancient inclusive counting and describes the next corresponding first day of the week, not a modern interval of eight complete twenty-four-hour periods.
Introduction
Historical and Cultural Context
Ancient Jewish and Mediterranean time reckoning commonly counted both the starting and ending days inclusively. Thus the first day of the week and the next first day can be described as an eight-day span when both Sundays are counted. The phrase should not be forced into modern elapsed-time arithmetic. John's repetition of the indoor setting and shut doors deliberately parallels the appearance one week earlier.
Why It Matters
The counting convention removes an apparent chronological oddity. John is describing a corresponding gathering about a week later.
The repeated setting also allows Thomas, who missed the first appearance, to encounter the risen Jesus under circumstances closely matching the testimony he had refused to accept.