Musnad Ahmad Hadith 8092

It is narrated from Abu Huraira (may Allah be pleased with him) that the Noble Prophet (ﷺ) once asked the noble companions (may Allah be pleased with them), "Whom do you consider a martyr among yourselves?" The companions (may Allah be pleased with them) replied, "The one who is killed while fighting in the way of Allah." The Noble Prophet (ﷺ) said, "If it were so, then the number of martyrs in my Ummah would be very few. Being killed in Jihad in the way of Allah is also martyrdom, dying due to a stomach illness is also martyrdom, drowning in water is also martyrdom, dying due to plague is also martyrdom, and a woman dying in the state of childbirth is also martyrdom."