Hadith 3554
Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) narrates: The Prophet Muhammad (peace and blessings be upon him) saw some people gathered around a man during a journey. He inquired about this, so the people informed him: Fasting is causing hardship for this man. The Prophet Muhammad (peace and blessings be upon him) said: Fasting during travel is not righteousness.