Bhagavatapurana 10.3.19.p3

10.3.19.p3

sa tvaṃ tri-loka-sthitaye sva-māyayā $ bibharṣi śuklaṃ khalu varṇam ātmanaḥ &

That very You, for the preservation of the three worlds, by Your own creative power / assume indeed a white form of Your own;