Matsyapurana 56.2

56.2

śaṃkaraṃ mārgaśirasi śambhuṃ pauṣe 'bhipūjayet
māghe maheśvaraṃ devaṃ mahādevaṃ ca phālgune //

Śaṅkara should be worshipped on the eighth day of the dark fortnight in the month of Mârgaśirṣa, Śambhu, on the corresponding day of Pauṣa, Maheśvara in Mâgha, Mahâdeva in Phâlguna, Sthâṇu in Chaitra, Śiva in Vaiśâkha, Paśupati in Jyaiṣṭha, Ugra in Âṣâḍha, Śarva in Śrâvaṇa, Trayambaka in Bhâdra, Hara in the month of Âśvîna, Îśâna in Kârtika. These pujâs should be performed every month, on all the 8th days of the dark fortnight. The devotee should worship the Brâhmaṇas, and should observe a fast after giving away cow, land, gold and cloth to them, especially to the devotees of Śiva. In the night time, Śiva should be worshipped with Pañchagavya and with urine of the cow, clarified-butter, cow’s milk, sesamum, barley, Kuśa grass, water, the water of the washing of the cows’ horns, the leaves of Śirîṣa, arka (Calatropis gigantea), leaves of Bilva (aegle marmelos) and curds.—1-6.