This tradition has been handed down on the authority of Salman al-Khair through another chain of transmitters.
Sahih Muslim Book 33, Hadith 234
← Previous Hadith I heard the Messenger of Allah (ﷺ) say: Keeping watch for a day and a night is better (in point of reward) than fasting for a whole month and standing in prayer every night. If a person dies (while, performing this duty), his (meritorious) activity will continue and he will go on receiving his reward for it perpetually and will be saved from the torture of the grave.

Sahih Muslim Book 33, Hadith 233 Next Hadith → While a man walks along a path, finds a thorny twig lying on the way and puts it aside, Allah would appreciate it and forgive him The Prophet (ﷺ) said: The martyrs are of five kinds: one who dies of plague; one who dies of diarrhoea (or cholera) ; one who is drowned; one who is buried under debris and one who dies fighting in the way of Allah.

Sahih Muslim Book 33, Hadith 235