नादत्ते कस्यचित्पापं न चैव सुकृतं विभुः। अज्ञानेनावृतं ज्ञानं तेन मुह्यन्ति जन्तवः ॥

nādatte kasyachit pāpaṁ na chaiva sukṛitaṁ vibhuḥ ajñānenāvṛitaṁ jñānaṁ tena muhyanti jantavaḥ

The Lord accepteth neither the evil-doing nor yet the well-doing of any. Wisdom is enveloped by unwisdom; therewith mortals are deluded.

In plain words: Krishna says that the Lord does not take on anyone's bad deeds or good deeds. People get confused because ignorance covers up their true knowledge.