Another reference is this...
And We imposed on them an exemplary punishment. Then they tasted the evil result of their conduct, and the end of their conduct was perdition. Allah has prepared a severe punishment for them (in the hereafter).
So fear Allah, O you men of understanding who have believed, for Allah has indeed sent down a message for you, a Prophet who rehearses God's Signs to you, containing clear explanations, so that he may lead forth those who believe and do righteous deeds from the depths of darkness into the light.
And those who believe in Allah and do righteous deeds He will admit into gardens beneath which rivers flow to dwell therein forever: Allah has indeed granted a most excellent provision for them" (Qur'an, 65:8-11). Just as there are numerous references to reckoning in the Holy Qur'an, there are also numerous references to it in the Sunnah of the Prophet (P): Many traditions warn the believers about its woes and perils. On p. 258, Vol.