الْعَفْوُ هُوَ التَّجَاوُزُ عَنْ مُسْتَحِقِّ الْعِقَابِ
Pardon is forgoing punishment for someone who is liable to it.
A Muʿtazilī explanation treated some minor sins as not truly entailing punishment and linked intercession after repentance from major sin to extra reward. The response emphasizes the usual sense of pardon: a deserved consequence is waived.
Increase in reward and removal of punishment are not interchangeable. Equating them obscures the specific point at issue.