The Prophet ﷺ passed by a man who was tossing and turning, and he asked about him. They said, "He is fasting, Prophet of Allah."So he called him over and ordered him to break his fast, saying, "Is it not enough for you to be in the path of Allah alongside the Messenger of Allah ﷺ, without also fasting?"
حدثنا زيد بن الحباب حدثني حسين بن واقد عن أبي الزبير قال سمعت
مر النبي ﷺ برجل يقلب ظهره لبطن فسأل عنه فقالوا صائم يا نبي الله فدعاه فأمره أن يفطر فقال أما يكفيك في سبيل الله ومع رسول الله ﷺ حتى تصوم
No references are available.
Its isnad is sahih. Zayd bin Hubab and Husayn bin Waqid the judge are both trustworthy, and Ahmad is alone in narrating the hadith with this wording. It has already come with the wording, "It is not righteousness to fast during travel," at 14363.