"When any one of you enters the Masjid, let him pray two Rak'ahs before he sits down." (Using translation from Nasāʾī 730)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «إِذَا جَاءَ أَحَدُكُمُ الْمَسْجِدَ فَلْيَرْكَعْ رَكْعَتَيْنِ قَبْلَ أَنْ يَجْلِسَ»