ANSWER:
It is Sunnah for the Muslim, when he leaves his house and heads towards the mosque, to recite the du’aa’ for walking to the masjid:
It was narrated that ‘Abd-Allaah ibn ‘Abbaas said: “… Then the muezzin gave the call to prayer, and he (the Prophet (peace and blessings of Allaah be upon him)) came out, saying, ‘Allaahumma aj’al fi qalbi nooran wa fi lisaani nooran waj’al fi sam’i nooran waj’al fi basari nooran waj’al min khalfi nooran wa min amaami nooran waj’al min fawqi nooran wa min tahti nooran, Allaahummah a’tini nooran (O Allaah, place with my heart light, and upon my tongue light, and within my ears light and within my eyes light, and place behind me light and in front of me light and above me light and beneath me light, O Allaah, bestow upon me light).”