Shiva Purana
माघासितचतुर्दश्यां महाबलसमर्चनम् ॥ विमुक्तिदं विशेषेण सर्वेषां पापिनामपि ॥ २५ ॥
The worship of Mahābala on the fourteenth day in the dark half of the month of Māgha yields salvation particularly even to the sinners.
english translation
mAghAsitacaturdazyAM mahAbalasamarcanam ॥ vimuktidaM vizeSeNa sarveSAM pApinAmapi ॥ 25 ॥
hk transliteration by Sanscript