Ayesha reported,

Prayer was first prescribed as two units. The traveler's prayer was left as it was, while the resident's prayer was made complete.Zuhri said, I asked Urwa, "Why does Ayesha pray the full prayer when traveling?"He replied, "She interpreted it the same way Uthman did."

Azami 5081

Sahih

عن عائشة قالت

الصلاة أول ما فرضت ركعتين فأقرد صلاة السفر وأتمت صلاة الحضر. قال الزهري فقلت لعروة: ما بال عائشة تتم؟ قال: تأولت ما تأول عثمان.

الأعظمي 5081صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Hajj
Chapter
Description of the Hajj of the Prophet ﷺ as narrated by Jabir and others, and the rulings mentioned therein
Section
Shortening the prayer at Mina
Numbering
Jami al-Kamil 5081 (2nd edition)
Azami 5081