The Du'aa (supplication) upon Going to the Masjid: "O Allah, lighten my heart, lighten my speech, lighten my audition,
lighten my insight and bless me with light from behind, front, above, under and cover me all with light"
[Muslim]
This is a very beautiful Doaa called Doaa-e-Noor.I have this in my book of sunnah,and i read it before fajr prayer because it is written in the book that Muhammad SAW did so.
Here is the full doaa in Arabic.
Translation.
O Allaah, place within my heart light; and upon my tongue light;
and within my ears light; and within my eyes light;
and place above me light; and beneath me light;
and on my right light; and on my left light;
and in front of me light; and behind me light;
and place light within my soul;
and augment light for me; and greaten light for me;
and grant me light and make me light.
O Allaah, bestow upon me light; and place light in my tendons;
and light in my flesh; and light in my blood;
and in light in my hair and light in my skin.
[O Allaah, place light for me in my grave and light in my bones]
[And increase me with light and increase me with light and increase me with light]
[And grant me light upon light]