Silsilat al-Ahadith al-Sahihah

Sayyidah Aisha (may Allah be pleased with her) says: Indeed, Sayyiduna Hamzah bin Amr Al-Aslami (may Allah be pleased with him) asked the Messenger of Allah (peace and blessings be upon him): O Messenger of Allah! I observe continuous fasting, so can I fast while traveling? The Prophet (peace and blessings be upon him) said: "(It is up to you) if you wish, then fast, and if you wish, then leave it."