The importance of offering two rak‘ahs upon entering the mosque for the Friday prayer

عَنْ جَابِرَ بْنَ عَبْدِ اللَّهِ رضى الله عنهما قَالَ قَالَ رَسُولُ اللّٰہ صلّى الله عليه وسلّم وَهُوَ يَخْطُبُ: إِذَا جَاءَ أَحَدُكُمْ وَالإِمَامُ يَخْطُبُ ـ أَوْ قَدْ خَرَجَ ـ فَلْيُصَلِّ رَكْعَتَيْنِ

Hazrat Jabir bin Abdullah^ra narrated that, “Allah’s Messenger^sa, while delivering the sermon, said: ‘If any of you arrives while the imam is delivering the sermon – or has come out for it – let him offer two rak‘ahs.”

(Sahih al-Bukhari, Kitab at-tahajjud, Bab ma ja’a fi t-tatawwu‘i mathna mathna, Hadith 1166)