It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Give those who walk to the mosques in the darkness the glad tidings of pulpits of light on the Day of Resurrection, the day when people will be terrified but they will not be terrified."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7602