Shiva Purana
षण्मासे वत्सरे वापि चातुर्मास्यादिपर्वणि ॥ अवश्यञ्च समभ्यर्चेन्नित्यं मल्लिङ्गमास्तिकः ॥ ३०॥
In the sixth month or in the year or on the fourth month and other festivals. A believer in Mallinga should certainly worship him daily.
english translation
SaNmAse vatsare vApi cAturmAsyAdiparvaNi ॥ avazyaJca samabhyarcennityaM malliGgamAstikaH ॥ 30॥
hk transliteration by Sanscript