The likeness [of the munâfiq] is as the likeness of one who kindled a fire; then, when it lighted all around him, Allâh took away their light and left them in darkness. So they could not see. They are deaf, dumb and blind, so they return not [to the Right Path]. (Quran 2:17)
Qatâdah – Allâh’s mercy be upon him – said:
This is the likeness Allâh has given of the Hypocrite (munâfiq); he says lâ ilâha illallâh and with it marries into the Muslims, inherits from the Muslims, fights alongside the Muslims, and protects his blood and wealth. But when death comes, [the testimony of faith] has no basis in his heart, and no reality in his actions, so the munâfiq is stripped of it at death and left in darkness and blindness wondering therein, just as he was blind about the right of Allâh and obedience to Him in his worldly life and deaf to the truth.
Source: Sayings of the Salaf