The one whom Allah will be angry with
The Messenger of Allah (sal Allahu alaihi wa sallam) said, “The slave will meet his Lord (on the Day of Resurrection) and Allah will say, ‘Did I not honour you and make you a leader, give you a spouse, and subjugate horses and camels for your use?’ He will say, ‘Yes indeed O Lord.’ Allah will say, ‘Did you think that you would meet Me?’ He will say, ‘No.” Allah will say, ‘I will forget you just as you forgot Me.’ Then a second slave will meet Him and He will say something similar to him. Then a third slave will meet Him and He will say something similar to him, but he (the third slave) will say, ‘I believed in You and in Your Book and in Your Messenger. I prayed, fasted and gave in charity,’ praising himself as much as he can. Then Allah will say, ‘Shall We not send Our witness against you?’ and he will wonder who that witness could be. Then a seal will be placed over his mouth and it will be said to his thigh, ‘Speak!’ So his thigh will speak as well as his bones (and other parts of his body), all witnessing against what he used to do, and thus, he will be left with no excuse. This is the hypocrite and that is the one whom Allah will be angry with.”
Allah says (interpretation of the meaning): And (remember) the Day that the enemies of Allah will be gathered to the Fire, so they will be collected there (the first and the last). Till, when they reach it (Hell-fire), their hearing (ears) and their eyes, and their skins will testify against them as to what they used to do. And they will say to their skins, “Why do you testify against us?” They will say: “Allah has caused us to speak, as He causes all things to speak, and He created you the first time, and to Him you are made to return.” [Fussilat 41:19-21]
This is what will happen in the case of the disbelievers and hypocrites (as the above Hadith mentions). When they see with their own eyes the severe torment that Allah has prepared for them, they will resort to lies and denials, claiming that they were righteous people, and that the testimony of the Angels, Messengers and righteous people who testified against them is false. At that point, Allah will place a seal over their mouths, and their hands and feet will speak of what they used to do. Then they will say to their own limbs, “Away with you! It was for your sake that I was arguing!” (As found in another Hadith in Sahih Muslim).
And Allah knows best!