Shiva Purana
अन्याभिर्मूर्तिभिः स्वाभिः पाति चांते निहन्ति च ॥ विष्णुः पालयते विश्वं कालकालस्य शासनात् ॥ ३३ ॥
He protects them in other forms of His own and ultimately kills them. Lord Vishnu rules the universe by the rule of time.
english translation
anyAbhirmUrtibhiH svAbhiH pAti cAMte nihanti ca ॥ viSNuH pAlayate vizvaM kAlakAlasya zAsanAt ॥ 33 ॥
hk transliteration by Sanscript