Abdullah bin Umar reported,

While we were praying with the Messenger of Allah ﷺ, a man from the congregation said, "Allah is the greatest, abundantly. Praise be to Allah, abundantly. Glory be to Allah, morning and evening."The Messenger of Allah ﷺ asked, "Who said such and such words?"A man from the congregation replied, "I did, Messenger of Allah."He said, "I was amazed by them," and he mentioned a phrase meaning that the gates of heaven were opened for them.Ibn Umar said, "I have not abandoned saying these words since I heard the Messenger of Allah ﷺ say this."

Nasai 887

Sahih

أخبرنا محمد بن شجاع المروذي قال حدثنا إسمعيل عن حجاج عن أبي الزبير عن عون بن عبد الله

عن ابن عمر قال

بينما نحن نصلي مع رسول الله ﷺ فقال رجل من القوم الله أكبر كبيرا والحمد لله كثيرا وسبحان الله بكرة وأصيلا فقال رسول الله ﷺ من القائل كلمة كذا وكذا فقال رجل من القوم أنا يا رسول الله قال عجبت لها وذكر كلمة معناها فتحت لها أبواب السماء قال ابن عمر ما تركته منذ سمعت رسول الله ﷺ يقوله

النسائي 887صحيح
Contents
Reference
Commentary
Ayat
Collection
Sunan Nasai Sughra
Book
Commencement
Chapter
Words with which prayer is begun
Numbering
Darussalam 887
Nasai 887