مختصر صحيح مسلم
Mukhtasar Sahih Muslim
Book of Remembrance
Saying tasbih after Fajr prayer.
Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings of Allah be upon him) said: Whoever says "Subhan Allah wa bihamdihi" one hundred times in the morning and in the evening, no one will come on the Day of Resurrection with a deed better than his, except one who says as much or more than this.