And it was narrated to me by Abu al-Tahir and Harmalah ibn Yahya, both saying: Ibn Wahb narrated to us, from Yunus, from Ibn Shihab, who said: 'Urwah ibn al-Zubayr narrated to me that 'A'ishah, the wife of the Prophet, may God bless him and grant him peace, said: "God made prayer obligatory as two rak'ahs when He first made it obligatory, then He completed it in residence, and the prayer of travel was kept upon the original obligation."