Commentaries:
Robertson's Word Pictures (NT)
After eight days (meq hmerav oktw). That is the next Sunday evening, on the eighth day in reality just like "after three days" and "on the third day."
Within (esw). Apparently in the same room as before.
Cometh (erxetai). Vivid dramatic present. The other items precisely as in verse John 20:19 save Thomas was with them.
Other Robertson's Word Pictures (NT) entries containing John 20:26:
John 14:27
John 20:19
John 21:14
Acts 1:3
Acts 20:7
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