Jami` at-Tirmidhi 3470

Ibn `Umar narrated that one day, :The Messenger of Allah (ﷺ) said to his Companions: “Say ‘Glory is to Allah and with His Praise (Subḥān Allāh, wa biḥamdih)’ a hundred times. Whoever says [it] one time, it is written for him ten, and whoever says it ten (times), it is written for him a hundred, and whoever says it a hundred (times), it is written for him a thousand, and whoever increases, Allah will increase for him, and whoever seeks Allah’s forgiveness, [Allah] will forgive him.”