I heard Abu Burda who accompanied Yazid bin Abi Kabsha on a journey. Yazid used to observe fasting on journeys. Abu Burda said to him, "I heard Abu Musa several times saying that Allah's Apostle said, 'When a slave falls ill or travels, then he will get reward similar to that he gets for good deeds practiced at home when in good health."
Reference: Sahih al-Bukhari 2996 In-book : Book 56, Hadith 205 USC-MSA web (English) : Vol. 4, Book 52, Hadith 239 (deprecated)
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