Sunnah Hadith
• Tahiyyat al-Masjid
Authentic
إِذَا دَخَلَ أَحَدُكُمُ الْمَسْجِدَ فَلْيَرْكَعْ رَكْعَتَيْنِ قَبْلَ أَنْ يَجْلِسَ
Idha dakhala ahadukumul-masjida falyarka' rak'atayni qabla an yajlis.
"When one of you enters the Mosque, he should pray two rakat (Tahiyyat al-Masjid) before sitting down."
Narrated by: Abu Qatadah
Sahih Bukhari 444, Sahih Muslim 714