It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "Three people will not be taken to account for what they eat, provided it is lawful: the one who is fasting, the one who eats suhur, and the one who stands guard (murabit) in the path of Allah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11962