Duaa-After completion of prayer in Masjid

After completion of prayer in Masjid
Recite:
سُبْحَانَ اللَّهِ وَالْحَمْدُ لِلَّهِ وَلَا إِلَهَ إِلَّا اللَّهُ وَاللَّهُ أَكْبَرُ

"Allah is Pure and all Praise is to Him. Besides Him there is no one worthy of worship, He is the Greatest."

(Mishkat, Chapter on Masjid)
When coming out of the Masjid recite Durood and Salaam first and thereafter recite:
رَبِّ اغْفِرْ لِي ذُنُوبِي وَافْتَحْ لِي أَبْوَابَ فَضْلِكَ
"O Lord, pardon my sins and open the doors of virtue for me".

(Mishkat)
Alternatively recite
اللَّهُمَّ إِنِّي أَسْأَلُكَ مِنْ فَضْلِكَ
"O Allah, I ask of you, Your Fadl (goodness)."

Duaa-When entering the Masjid

When entering the Masjid recite Durood and Salaam first and thereafter recite:
رَبِّ اغْفِرْ لِي ذُنُوبِي وَافْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
"O Lord, forgive my sins and open the doors of mercy for me".

(Mishkat)
Alternatively recite
اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
"O Allah, open the doors of mercy".

(Mishkat)
 

Duaa-When going for Fajr Prayer

Recite:
اللَّهُمَّ اجْعَلْ فِي قَلْبِي نُورَاً وَفِي بَصَرِي نُورَاً وَفِي سَمْعِي نُورَاً وَعَنْ يَمِينِي نُورَاً وَعَنْ شِمَالِي نُورَاً وَاجْعَلْ لِي نُورَاً وَفِي عَصَبِي نُورَاً وَفِي لَحْمِي نُورَاً وَفِي دَمِي نُورَاً وَفِي شَعْرِي نُورَاً وَفِي بَشَرِي نُورَاً وَفِي لِسَانِي نُورَاً وَاجْعَلْ فِي نَفْسِي نُورَاً وَأَعْظِمْ لِي نُورَاً وَاجْعَلْنِي نُورَاً وَاجْعَلْ مِنْ خَلْفِي نُورَاً وَمِنْ أَمَامِي نُورَاً وَاجْعَلْ مِنْ فَوْقِي نُورَاً وَمِنْ تَحْتِي نُورَاً اللَّهُمَّ أَعْطِنِي نُورَاً
"O Allah, give me Nur in my heart, me eyes, ears, on my right side, on my left side. Specify Nur for me and my progeny. Grant Nur in my flesh, my blood, my hair, my skin, my tongue and my nafs (soul) and grant Nur all around me."

(Hisnul Hasin)

When coming out of the toilet

Recite:
غُفْرَانَكَ

"(O Allah) I seek forgiveness and pardon from You".
الْحَمْدُ لِلَّهِ الَّذِي أَذْهَبَ عَنِّي الْأَذَى وَعَافَانِي
"All Praise be to Allah, who removed the difficulty from me and gave me ease (relief)".

(Mishkat)

Duaa-When entering the toilet recite

When entering the toilet
When entering the toilet recite:
Bismillah "In the name of Allah"
It is in the hadith that between the eyes of Satan and the private parts of man Bismillah is a barrier therefore, this dua should be recited.
اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْخُبْثِ وَالْخَبَائِثِ
"O Allah. I seek refuge in You from the male female evil and Jinns".

(Mishkat, Hisnul Hasin)