After the Light of the World discourse begins, John notes that Jesus spoke these words 'in the treasury, as he taught in the temple.' The term can suggest a vault to modern readers, but the Gospel is locating public teaching.
No one arrests Jesus there because, John says, his hour has not yet come.
Temple sources associate collection chests for offerings with the Court of the Women, a large public court accessible to Israelite men and women. The Greek term gazophylakion can refer to the treasury or treasury area. Jesus could therefore teach publicly 'in the treasury' without being inside a restricted financial storeroom.
The same broad Temple environment appears in Synoptic accounts of the widow's offering.
The architectural context helps readers visualize an open and highly visible setting. Jesus' claims are being made at the religious center of Jerusalem, not hidden from public scrutiny.
John's repeated observation that he is not arrested despite this visibility reinforces the Gospel's theme that the timing of Jesus' death is not controlled simply by proximity to hostile authorities.