“Whoever says, when he enters the morning and when he enters the evening: Subḥān Allāh wa bi-ḥamdih (glory be to Allah and praise is His) one hundred times, no one shall come on the Day of Resurrection with anything better than what he has come with, except a man who said the like of what he said or added to it.”

Narrated by Muslim (no. 2692).
And in the wording of Abū Dāwūd (no. 5091): “Subḥān Allāh al-ʿAẓīm wa bi-ḥamdih (Glory be to Allah, the Magnificent, and praise is His)”, from the narration of Abū Hurayrah – may Allah be pleased with him.

Brief Explanation of the Hadith

Remembrance of Allah holds a lofty rank; it is among the greatest means of elevating ranks and expiating sins. Allah praised the men and women who remember Him in His Book, and many aḥādīth have come urging remembrance and clarifying the immense reward it carries.
Among them is what the Prophet – may Allah’s peace and blessings be upon him – informed: that whoever says upon entering the morning – that is, at the beginning of the day when the time of morning enters – and upon entering the evening – that is, when the time of evening begins – “Subḥānallāh...” That is: I declare Allah, the Exalted, far above and sanctified from everything unbefitting His Majesty and Perfection—such as having a partner, a child, or any form of deficiency or fault. And I praise Him and extol Him for the perfection of His Attributes and the beauty of His Actions; for He alone, exalted is He, is worthy of all praise and glorification.
And his saying: “wa bi-ḥamdih (and praise is His)” includes the acknowledgment that this glorification is only by Allah’s aid and facilitation, and that the favor belongs to Him alone—for He inspired His servant to remember Him and granted him success in doing so.
Thus, the phrase: “Subḥānallāh wa bi-ḥamdih (Glory be to Allah and praise is His)” combines both negation and affirmation: it is a declaration of Allah’s transcendence above every fault and deficiency, and an affirmation of the Perfection of His Attributes, together with praise and glorification.
Whoever recites this dhikr one hundred times—whether consecutively or spread throughout the time (though it is better to recite them in succession, so that forgetfulness or distraction does not intervene)— “None will come on the Day of Resurrection with anything better than what he has come with” — meaning: no one will attain a reward or recompense like his, nor will anyone surpass him in virtue and deed, except one who likewise recited this remembrance or increased upon it, thus becoming greater in reward than him.
This indicates that the virtue is not restricted to one hundred; rather, whoever increases, Allah increases him in bounty and reward.
It is befitting that one recites it with presence of heart and sincerity, with reverence for the Lord — Glorified and Exalted — and with mindfulness of the meanings of exaltation and praise, so that the tongue is in harmony with the heart, and the servant attains the immense reward on the Day of Resurrection.