Sayyiduna Ibn Umar (may Allah be pleased with them both) says: When the verses were revealed that make (Hell) obligatory, such as the saying of Allah: "Those who consume the wealth of orphans unjustly" [Surah al-Nisa: 10] to the end of the verse, and such as "Those who consume usury (riba)" [Surah al-Baqarah: 275], and such as His saying: "And whoever kills a believer intentionally, his recompense is Hell" [Surah al-Nisa: 93], he said: We used to testify about anyone who did any such deed that he was among the people of Hell. Then when this verse was revealed: "Indeed, Allah does not forgive that partners be associated with Him, and He forgives what is less than that for whomever He wills" [Surah al-Nisa: 48], we stopped giving such testimony and began to fear for them on account of what Allah had made obligatory for them.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13275