Shiva Purana
महादेव उवाच ॥ त्वया मान्यो विष्णुरसौ तथा शतधृतिः स्वयम् ॥ कपालम्वैधसम्वापि नीललोहित धारय ॥ ६१॥
Lord Siva said:— This Viṣṇu shall be honoured by you as well as by Brahmā, O Nīlalohita, hold the skull of Brahmā as an atonement.
english translation
mahAdeva uvAca ॥ tvayA mAnyo viSNurasau tathA zatadhRtiH svayam ॥ kapAlamvaidhasamvApi nIlalohita dhAraya ॥ 61॥
hk transliteration by Sanscript