The account of the man of Ya Sin

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that when the companion of Ya Sin (Habib al-Najjar) said: "O my people, follow the messengers" [Surah Ya Sin: 20], (the people of his nation) strangled him so that he would die. At that moment he turned towards the prophets and said: "Indeed, I have believed in your Lord, so listen to me" [Surah Ya Sin: 25], meaning: be witnesses to this faith of mine.
This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that al-As bin Wa'il came to the Messenger of Allah (peace and blessings be upon him) carrying a decayed bone and crumbled it (with his hand), then said: "O Muhammad, will Allah raise this (again) when I see it in this (decayed) state?" He (peace and blessings be upon him) said: "Yes, Allah will raise this again, then He will cause you to die, then He will bring you to life, and then He will enter you into the fire of Hell." The narrator said: Thereupon these verses were revealed: "Does man not see that We created him from a sperm-drop, and then behold, he is an open adversary?" [Surah Ya Sin: 77] to the end of the surah.
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.