No one can guarantee heaven on the Day of Judgment. In verses 12-15 of Surat
Al-Hadid Allah describes the scene on judgment day, comparing believers who
have the light of Iman (faith), to hypocrites, those who are resurrected without
light but falsely presume that they were among the believers. On that day, says
Nouman Ali Khan, the true believers explain to the hypocrites how they lost
their faith: it starts with putting yourself in a wrong environment then it’s a
downward spiral. The light in the hearts of the believers is the only thing that
matters on judgement day, anything else is worthless.