4.3 Player Positions and Rotation (Rule 7)

At the moment of service, all players must be within their respective courts and in the rotational order recorded on the line-up sheet (Rule 7.1). Players are numbered in a rotational order 1–6, starting from the right back position and moving counterclockwise.

Source: Rule 7.1, Rule 7.3.1, Rule 7.4.1, Rule 7.4.2, Rule 7.4.3

Send this to your friend — argument over.