The Messenger of Allah said: "The martyrs are five: Those who die of the plague, stomach illness, drowning, being crushed, and the martyr in the cause of Allah"
Jami` at-Tirmidhi Book 10, Hadith 99
← Previous Hadith "I heard my grandfather, the father of my mother, Simak bin Al-Walid Al-Hanadi narrating, that he heard Ibn Abbas narrated, that he heard the Messenger of Allah saying: "Whoever has two predecessors (in death) among my Ummah, then Allah will admit them into Paradise."So Aishah said to him: "What about one from your Ummar who has one precessor?" He (pbuh) said: "And whoever has one predecessor O Muwaffaqqah!" So she said: "What about one who does not have a predecessor from your Ummah?" He said: "I am the predecessor for my Ummah: you will never suffer (in grief) for (the loss of) anyone similar to me."

Jami` at-Tirmidhi Book 10, Hadith 98 Next Hadith → "Sulaiman bin Surad said to Khalid bin Urfutah - or, Khalid said to Sulaiman - 'Did you hear the Messenger of Allah saying: "Whoever is killed by his stomach then he will not be punished in the grave"?' One of them said to the other: "Yes."

Jami` at-Tirmidhi Book 10, Hadith 100