Abu Umama reported Allah's Messenger ﷺ as saying, "If anyone fasts for a day while on jihad,* Allah will put between him and hell a ditch as wide as the distance between heaven and earth." *Mirqat gives this meaning, but says it may refer to the hajj, the 'umra, seeking knowledge, or desiring to please Allah. The Arabic is 'in Allah’s way.' Tirmidhi transmitted it.