When X abets Y to commit murder of Z and Y actually commits the murder, X is liable under Section 109 of the Indian Penal Code for abetment. Section 109 prescribes punishment for abetment when the abetted offence is committed, providing that the abettor shall be punished with the punishment provided for the original offence (murder under Section 302). X cannot be charged directly under Section 302 (murder) as he did not commit the act himself, nor under Section 120B (criminal conspiracy) or Section 115 (abetment of offence punishable with death or imprisonment for life if offence not done).