Ayesha reported,

The Messenger of Allah ﷺ used to open the prayer with the takbir and begin the recitation with "Praise be to Allah, Lord of all the worlds" [Fatihah 1:2]. The hadith continues.

Azami 1961

Sahih

عن عائشة قالت

كان رسول الله ﷺ يستفتح الصلاة بالتكبير، والقراءة ب {الحمد لله رب العالمين}. الحديث.

الأعظمي 1961صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Prayer
Chapter
Description of prayer, the takbir, standing, and recitation
Section
Beginning with Fatihah before the surah
Numbering
Jami al-Kamil 1961 (2nd edition)
Azami 1961