Manava Dharmashastra 1.28

1.28

yaṃ tu karmaṇi yasmin sa nyayuṅkta prathamaṃ prabhuḥ
sa tad eva svayaṃ bheje sṛjyamānaḥ punaḥ punaḥ //

But to whatever course of action the Lord at first appointed each (kind of beings), that alone it has spontaneously adopted in each succeeding creation.