Sherad ji
Throughout the entirety of Siri Guru Granth Sahib, and from the inception of Sikhism with Nanaak, deliverance from the cycle of life and death is granted by the grace of the True Guru to those who surrender to him in simran, prayer, and detachment from ego and maya.
One expression that is often used is "your papers will be torn up" and then "you will be in the God's darshan (court)".
You have spoken of 'purifying karma' and so these lines from Japj(u)j - 20th Pauri
BrIAY miq pwpw kY sMig ]
bharee-ai mat paapaa kai sang.
But when the intellect is stained and polluted by sin,
Ehu DopY nwvY kY rMig ]
oh Dhopai naavai kai rang.
it can only be cleansed by the Love of the Name.
puMnI pwpI AwKxu nwih ]
punnee paapee aakhan naahi.
Virtue and vice do not come by mere words;
kir kir krxw iliK lY jwhu ]
kar kar karnaa likh lai jaahu.
actions repeated, over and over again, are engraved on the soul.
Awpy bIij Awpy hI Kwhu ]
aapay beej aapay hee khaahu.
You shall harvest what you plant.
nwnk hukmI Awvhu jwhu ]20]
naanak hukmee aavhu jaahu. ||20||
O Nanak, by the Hukam of God's Command, we come and go in reincarnation. ||20||
There are many other verses that would apply to your question. If you are interested in a discussion where Buddhist views and Sikh views are contrasted, why not have this thread moved to Interfaith Dialogs?
God is always cheerful.