Musannaf Ibn Abi Shaybah 9156 — Those who fasted little

Maymun said: A man said to Sayyiduna Abu Dharr (may Allah be pleased with him), "I have not heard you mention fasting; what is the reason for that?" He said, "Fasting is certainly a deed of reward, but not here." That is, in some situations the reward of other deeds, such as jihad, is greater than that of fasting. Likewise, not fasting while travelling sometimes becomes better.