Hazrat Fatima az-Zahra (A.S.) used to work very hard in her house. Her father our Holy Prophet, Prophet Muhammad (S) could see how hard she worked.
So one day he told her that he was going to give her something that would be better than a helper or anything else in the world.
Do you know what he gave her?
He gave her Tasbeeh.
He told her that after every Salaat she should say:
1. Allahu Akbar - 34 times
2. Alhamdulillah - 33 times
3. Subhanallah - 33 times
This is what we call the Tasbeeh of Hazrat Fatima az-Zahra (A.S.)
The Salaat is like a beautiful flower and the Tasbeeh of Bibi Fatima (A.S.) gives that beautiful flower a beautiful smell.
So after every Salaat we should say the Tasbeeh of Hazrat Fatima az-Zahra (A.S.) because we want our Salaat to be like a beautiful flower with a beautiful smell.