It was narrated from the Messenger of Allah ﷺ that he said, "Whoever says, 'Praise be to Allah as many times as the number of His creation, and praise be to Allah filling all that He has created, and praise be to Allah as many times as what is in the heavens and the earth, and praise be to Allah filling all that is in the heavens and the earth, and praise be to Allah as many times as what His book has recorded, and praise be to Allah filling all that His book has recorded, and praise be to Allah as many times as the number of all things, and praise be to Allah filling all things,' and says, 'Glory be to Allah,' the same number of times, this is a tremendous thing."
حدثنا هشام بن عبد الملك حدثنا أبو عوانة عن حصين عن سالم أن
حدث عن رسول الله ﷺ أنه قال من قال الحمد لله عدد ما خلق والحمد لله ملء ما خلق والحمد لله عدد ما في السموات والأرض والحمد لله ملء ما في السموات والأرض والحمد لله عدد ما أحصى كتابه والحمد لله ملء ما أحصى كتابه والحمد لله عدد كل شيء والحمد لله ملء كل شيء وسبحان الله مثلها فأعظم ذلك
No references are available.
Its isnad is sahih. Salim is Ibn Abu Jaad, and Husayn is Ibn Abdul-Rahman Sulami, and both are well-known trustworthy narrators whose hadith are found in the collections of the group. Haythami said, 10/87, its narrators are the narrators of Sahih.