Hadith No: 1

Narrated `Aisha:

"When the prayers were first enjoined they were of two rak`at each. Later the prayer in a journey was kept as it was but the prayers for non-travelers were completed." Az-Zuhri said, "I asked `Urwa what made Aisha pray the full prayers (in journey)." He replied, "She did the same as `Uthman did."

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Reference: Saheeh al-Bukhari Book 18 Tradition No. 11

Hadith No: 2

'A'isha reported:

The prayer was prescribed as consisting of two rak'ahs, the prayer in travelling remained the same, but the prayer at the place of residence was completed. (Zuhri said he asked 'Urwa why 'A'isha said prayer in the complete form during journey, and he replied that she interpreted the matter herself as 'Uthman did.)

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Reference: Saheeh Muslim Book 6 Tradition No. 3

Hadith No: 3
Al-Darimi - Sunan al-Darimi - Book of Prayer - Chapter on Shortening Prayer During Travel
Volume: (1) - Page Number: (355)
1509 - Muhammad ibn Yusuf narrated to us, saying: Sufyan ibn Uyaina narrated to us, who said: I heard al-Zuhri mention from Urwa ibn al-Zubair, from Aisha, who said: "Prayer was first commanded to be two units (rak'ahs). Thus, the prayer of travel was established as two units, while the prayer of those residing was completed." I asked, "Why was she completing the prayer during travel?" He replied, "She interpreted it as Uthman interpreted it."

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Reference: Sunan al-Daaremi Book 1