Bhagavatapurana 1.8.30

1.8.30

janma karma ca viśvātmann ajasyākarturātmanaḥ /
tiryaṅnṝṣiṣu yādaḥsu tadatyantaviḍambanam //

30. That thou, O Lord of all, (Antaryamin of all), that hast no birth and no action, hast births and hast deeds to do, among beasts (as Varaha,) among men (as Rama,) among Rishis (as Vamana,) and among aquatic beings (as Matsya), is wholly a matter of Thy will to behave like the creatures of the world.