Sunnats of the Musjid

1. Dress appropriately when coming to the musjid. 
2. Remove any foul odour from your body, clothing or mouth before entering the musjid e.g. after eating onions or something with a foul odour, standing near a fire, etc.
3. Apply itr before coming to the musjid if you are able to.
4. Proceed to the musjid calmly and in a dignified manner. Do not come to the musjid running.
5. It is better for one to be in the state of wudhu when entering the musjid.
6. Recite the masnoon duas when proceeding to the musjid. Some of the masnoon duas are: 

Dua One: The one who recites the following dua when leaving for the musjid acquires the special mercy of Allah Ta'ala, and seventy thousand malaa’ikah (angels) make dua for his forgiveness.

اللَّهُمَّ إِنِّي أَسْأَلُكَ بِحَقِّ السَّائِلِينَ عَلَيْكَ وَأَسْأَلُكَ بِحَقِّ مَمْشَايَ هَذَا فَإِنِّي لَمْ أَخْرُجْ أَشَرًا وَلَا بَطَرًا وَلَا رِيَاءً وَلَا سُمْعَةً وَخَرَجْتُ اتِّقَاءَ سَخَطِكَ وَابْتِغَاءَ مَرْضَاتِكَ فَأَسْأَلُكَ أَنْ تُعِيذَنِي مِنَ النَّارِ وَأَنْ تَغْفِرَ لِي ذُنُوبِي إِنَّهُ لَا يَغْفِرُ الذُّنُوبَ إِلَّا أَنْتَ

O Allah ! I beg You, through the intermediary of those who turn to You in dua, and I beg You, through the intermediary of this walking of mine – for indeed I have neither come out due to pride, nor boastfulness, nor to show off, nor to impress people. I have come out fearing Your anger and seeking Your pleasure. Thus, I beg You to save me from the fire (of Jahannum) and to forgive my sins, indeed only You can forgive sins. (Ibn Majah)