1. 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.
اَللّٰهُمَّ إِنِّيْ أَسْأَلُكَ بِحَقِّ السَّائِلِيْنَ عَلَيْكَ وَأَسْأَلُكَ بِحَقِّ مَمْشَايَ هٰذَا فَإِنِّيْ لَمْ أَخْرُجْ أَشَرًا وَلَا بَطَرًا وَلَا رِيَاءً وَلَا سُمْعَةً وَخَرَجْتُ اِتِّقَاءَ سَخَطِكَ وَابْتِغَاءَ مَرْضَاتِكَ فَأَسْأَلُكَ أَنْ تُعِيْذَنِيْ مِنَ النَّارِ وَأَنْ تَغْفِرَ لِيْ ذُنُوْبِيْ إِنَّهُ لَا يَغْفِرُ الذُّنُوْبَ إِلَّا أَنْتَ
O Allah Ta’ala! 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.
Note: In the narration of Musnad Ahmad, it is also mentioned that seventy thousand malaa’ikah (angels) make dua for his forgiveness and he receives the special mercy of Allah Ta’ala until he completes his salaah.
Dua Two:
اَللّٰهُمَّ اجْعَلْ فِيْ قَلْبِيْ نُوْرًا وَفِيْ لِسَانِيْ نُوْرًا وَاجْعَلْ فِيْ سَمْعِيْ نُوْرًا وَاجْعَلْ فِيْ بَصَرِيْ نُوْرًا وَاجْعَلْ مِنْ خَلْفِيْ نُوْرًا وَمِنْ أَمَامِيْ نُوْرًا وَاجْعَلْ مِنْ فَوْقِيْ نُوْرًا وَمِنْ تَحْتِيْ نُوْرًا اَللّٰهُمَّ أَعْطِنِيْ نُوْرًا
O Allah Ta’ala! Instil in my heart noor, and in my tongue noor, and instil in my hearing noor, and instil in my vision noor, and place behind me noor, and before me noor, and place above me noor, and below me noor. O Allah Ta’ala! Bless me with noor.
2. Enter the musjid with the right foot.
عن أنس بن مالك رضي الله عنه أنه كان يقول من السنة إذا دخلت المسجد أن تبدأ برجلك اليمنى وإذا خرجت أن تبدأ برجلك اليسرى (المستدرك على الصحيحين للحاكم، الرقم: 791
It is reported that Hazrat Anas (radhiyallahu anhu) said, “It is from the sunnah that when you enter the musjid, you should enter with your right foot, and when you exit from the musjid, you should exit with your left foot.”
3. Recite the masnoon duas when entering the musjid. Some of the masnoon duas are as follows:
Dua One
بِسْمِ اللهِ وَالصَّلاَةُ وَالسَّلاَمُ عَلٰى رَسُوْلِ اللهِ اَلّٰلهُمَّ افْتَحْ لِيْ أَبْوَابَ رَحْمَتِكَ
(I enter) with the name of Allah Ta’ala. May peace and salutations be upon Hazrat Rasulullah (sallallahu alaihi wasallam). O Allah Ta’ala, open for me the doors of Your mercy.
Dua Two
اَلّٰلهُمَّ افْتَحْ لَنَا أَبْوَابَ رَحْمَتِكَ وَسَهِّلْ لَنَا أَبْوَابَ رِزْقِكَ
O Allah Ta’ala, open for us the doors of Your mercy and make easy for us the avenues of Your sustenance.
Dua Three
بِسْمِ اللهِ وَالصَّلاَةُ وَالسَّلاَمُ عَلٰى رَسُوْلِ اللهِ رَبِّ اغْفِرْ لِيْ ذُنُوبِيْ وَافْتَحْ لِيْ أَبْوَابَ رَحْمَتِكَ
(I enter) with the name of Allah Ta’ala. May peace and salutations be upon Hazrat Rasulullah (sallallahu alaihi wasallam).O my Rabb, forgive my sins and open for me the doors of Your mercy.
Dua Four
أَعُوْذُ بِاللهِ العَظِيمِ وَبِوَجْهِهِ الْكَرِيْمِ وَسُلْطَانِهِ القَدِيْمِ مِنَ الشَّيْطَانِ الرَّجِيْمِ
I seek protection in Allah Ta’ala, the Most Great, and (I seek protection) in His noble countenance and in His eternal might and power from the accursed Shaitaan.
Through reciting the above dua, one will receive divine protection from Shaitaan for the entire day.
عن عبد الله بن عمرو بن العاص رضي الله عنهما قال كان رسول الله صلى الله عليه وسلم يقول إذا دخل المسجد قال أعوذ بالله العظيم وبوجهه الكريم وسلطانه القديم من الشيطان الرجيم قال فإذا قال ذلك قال الشيطان حفظ مني سائر اليوم (سنن أبي داود، الرقم: 466)
Hazrat Abdullah bin Amr bin Aas (radhiyallahu anhu) reports that when Hazrat Rasulullah (sallallahu alaihi wasallam) would enter the musjid, he would recite the following dua:
أَعُوْذُ بِاللهِ العَظِيْمِ وَبِوَجْهِهِ الْكَرِيْمِ وَسُلْطَانِهِ القَدِيْمِ مِنَ الشَّيْطَانِ الرَّجِيْمِ
Hazrat Rasulullah (sallallahu alaihi wasallam) said that when a person recites this dua, Shaitaan says, “He has gained divine protection from me for the entire day.”
4. Make the intention of nafl i’tikaaf for as long as you will remain in the musjid.
5. Upon entering the musjid, make salaam to those in the musjid, provided they are not engaged in any ibaadah. However, if people are engaged in salaah, then do not make salaam.