Umar bin Sa'd narrates from his father, Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) said: "I marvel at the believer: if some good comes to him, he praises and thanks Allah Almighty; and if a calamity befalls him, he still praises Allah and is patient. So the believer is rewarded in every state, even for the morsel he puts into his wife's mouth."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6555