Shiva Purana
सर्वेषां शिवलिंगानां सार्वभौमो महाबलः ॥ चतुर्युगे चतुर्वर्णस्सर्वपापापहारकः॥ ४३॥
Mahābala is the emperor of all phallic images. It assumes four different colours in the four Yugas. It dispels all sins.
english translation
sarveSAM zivaliMgAnAM sArvabhaumo mahAbalaH ॥ caturyuge caturvarNassarvapApApahArakaH॥ 43॥
hk transliteration by Sanscript