Code of Criminal Procedure, 1973
Chapter 32 Execution, Suspension, Remission and Commutation of Sentences
Section 427: Sentence on offender already sentenced for another offence
Provided that where a person who has been sentenced to imprisonment by an order under section 122 in default of furnishing security is, whilst undergoing such sentence, sentenced to imprisonment for an offence committed prior to the making of such order, the latter sentence shall commence immediately.