Sahih Muslim Book 004, Hadith Number 1548.

Chapter : Excellence of observing two Rak'ahs in the mosque for one who comes back from a journey.

'Urwa reported 'Aisha to be saying: I have never seen the Messenger of Allah (may peace be upon him) observing the supererogatory prayer of the forenoon, but I observed it. And if the Messenger of Allah (way peace be upon him) abandoned any act which he in fact loved to do, it was out of fear that if the people practised it constantly, it might become obligatory for them.

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