Chapter: It is recommended to greet the masjid by praying two rak`ah, and it is disliked to sit before praying these two rak`ah, and this is prescribed at all times
Abu Qatada (a Companion of the Prophet) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: When any one of you enters the mosque, he should observe two rak'ahs (of Nafl prayer) before sitting.
Authentic
