Samvartta Smriti 29

29

bhikṣāṭanamataḥ kṛtvā svastho hyekātmanaḥ śrutiḥ
asnātvā caiva yo bhuṅkte gāyatryaṣṭaśataṃ japet

Then, having gone on his begging rounds, healthy, with undivided mind, according to revelation; / and he who eats without having bathed should mutter one hundred and eight Gāyatrīs.