The Messenger of Allah ﷺ said one day to his companions, "Say 'Glory be to Allah and praise be to Him' a hundred times. Whoever says it once, ten good deeds are recorded for him. Whoever says it ten times, a hundred are recorded for him. Whoever says it a hundred times, a thousand are recorded for him. Whoever does more, Allah will give him more. And whoever seeks Allah's forgiveness, He will forgive him."
حدثنا إسمعيل بن موسى الكوفي حدثنا داود بن الزبرقان عن مطر الوراق عن نافع
قال رسول الله ﷺ ذات يوم لأصحابه قولوا سبحان الله وبحمده مائة مرة من قالها مرة كتبت له عشرا ومن قالها عشرا كتبت له مائة ومن قالها مائة كتبت له ألفا ومن زاد زاده الله ومن استغفر الله غفر له
No references are available.
[hasan] Takhrij: Dawud bin Zubarqan was corroborated by Rawh bin Qasim, as found in Nasai's Amal al-Yawm wal-Layla, no. 160, and Kubra, no. 9988, and by Matar Warraq, who is hasan al-hadith.