John 2:6

And there were set there six waterpots of stone, after the manner of the purifying of the Jews, containing two or three firkins apiece.

Cross-reference

John 3:25 Historical context

John 3:25 mentions a dispute about ceremonial washing—directly connects to the purification jars in this verse.

John 11:55 Historical context

John 11:55 mentions people going to purify themselves before Passover, connecting to the purification theme of these stone jars.

Mark 7:2-5 discusses Jewish ceremonial washing traditions—clearly linked to the purification water jars described here.

Hebrews 9:10 describes 'various washings' and 'regulations for the body' — the same Jewish purification practices these stone jars served.

Mark 7:4 Parallel

Mark 7:4 describes Pharisaic washings of cups, pots, and hands — the same Jewish purification traditions these jars were used for.