Reference to return substitutions is found in:
The provision as it is printed, and everything on Ruleside that turns on it.
Apart from the dispensation for a substituted player to return to play in the match, all other provisions of Law 3 and the Laws of the Game apply to return substitutes. In particular, the substitution procedure outlined in Law 3 must be followed.
Verdicts that turn on it 1
Walk the tree to any of these and this clause is part of the answer.
The Laws of the Game are published by The IFAB and quoted here for the purpose of explaining the decisions on this site. Ruleside is not affiliated with The IFAB or FIFA. Every clause of Notes and modifications that Ruleside cites.