Ahsan Allahu Ilaykum, Is it possible for a person to die, face the punishment in the grave, and then on the Day of Judgement, be forgiven by Allah Azza Wa Jall and enter Jannah without going to the hellfire? And is the reverse (Reward in the grave, punishment in the hereafter) possible?

Ustadh AbdulAziz al-Haqqan

Yes, Imam Ibn Baz said the disobedient believer may be punished in his grave and that Allah may then pardon him on the Day of Resurrection and enter him into Jannah, because he is under the will of Allah.