Shiva Purana
यथा जलं जले क्षिप्तं क्षीरे क्षीरं घृते घृतम् ॥ एक एव तदा विष्णुः शिवे लीनो न चान्यथा ॥ ३१ ॥
Just as water poured into water, or milk poured into milk, or ghee poured into ghee becomes one with those things, so also Viṣṇu is merged into Śiva, not otherwise.
english translation
yathA jalaM jale kSiptaM kSIre kSIraM ghRte ghRtam ॥ eka eva tadA viSNuH zive lIno na cAnyathA ॥ 31 ॥
hk transliteration by Sanscript