Musannaf Ibn Abi Shaybah

Hazrat Abdullah bin Shaddad narrates that it was the custom of the Bedouins of Banu Tamim that when the Prophet (peace and blessings of Allah be upon him) concluded the prayer with salam, they used to say: "O Allah! Grant us wealth and children." Upon this, the following verse was revealed { وَلاَ تَجْہَرْ بِصَلاَتِکَ وَلاَ تُخَافِتْ بِہَا }