Manava Dharmashastra 3.75

3.75

svādhyāye nityayuktaḥ syād daive caiveha karmaṇi
daivakarmaṇi yukto hi bibhartīdaṃ carācaram //

Let (every man) in this (second order, at least) daily apply himself to the private recitation of the Veda, and also to the performance of the offering to the gods; for he who is diligent in the performance of sacrifices, supports both the movable and the immovable creation.