Sunan An-Nasa'i

It was narrated from Abu Hurairah that the Prophet said:""Whoever throws himself, he will be in the Fire of Hell, throwing himself down forever and ever. And whoever kills himself with a piece of iron""- then I missed something ( one of the narrators) Khalid said-""will have his piece of iron in his hand, stabbing himself in the stomach in the Fire of Hell, forever and ever