What is the status of the hadith stating that a person who is not forgiven during Ramadan will enter hell and be removed from Allah's mercy?

Summary

The hadith narrated by Ibn Hibban from Abu Hurairah, in which the Prophet said amen to Jibril's supplication, shows that a person who does not obtain forgiveness during Ramadan is among the losers. Muslims are encouraged to worship with faith and earnest effort in the month. The circulated supplication of Jibril listing three matters, namely not seeking forgiveness from parents, friends and those around one before Ramadan, is ruled fabricated and may not be spread except to explain that it is false. The authentic hadith mentions three different matters: not being forgiven in Ramadan, failing to treat parents well until they die, and not sending blessings upon the Prophet when his name is mentioned.

Written in our own words from the original fatwa — check the source before acting on it.