How is it possible for a person to stand before his Lord while his own limbs speak, and what is the wisdom behind the presence of the two angels on his shoulders when Allah knows all these sins without them?

Allah knew what creation would do before He created them, and He inscribed it with Him. He sent messengers, revealed scriptures, and established proofs and clear evidences. Allah holds creation accountable based on the deeds they actually performed, which the angels recorded. On the Day of Resurrection, the book of deeds of every human will be presented. Some servants will deny what the angels recorded, so their mouths will be sealed, and their limbs will testify against them regarding what they did, so that Allah's conclusive argument against them may be established, and their excuse be cut off.