The Law Code of Yājñavalkya 3.1.407

3.1.407

kāravaḥ sūpakārādayaḥ | śilpinaś citrakāracailanirṇejakādayaḥ | ayaṃ cāśaucābhāvaḥ kiṃviṣaya ity apekṣāyāṃ karmanimittaiḥ śabdais tattadasādhāraṇasya karmaṇo buddhisthatvāt tatraiva drṣṭavyaḥ | ata eva viṣṇuḥ na rājñāṃ rājakarmaṇi, na vratināṃ vrate, na satriṇāṃ satre, na kārūṇāṃ kārukarmaṇi (ViDh 22.48–51) iti pratiniyataviṣayam evāśaucābhāvaṃ darśayati | śātātapīye 'py uktam |

"Laborers" are cooks and the like. "Craftsmen" are painters, washermen of clothes, and the like. And if it is questioned as to what domain this absence of ritual impurity applies, since the specific activity of each respective person is called to mind by words that designate their occupation, it should be regarded as applying only to that. Therefore Viṣṇu shows that the absence of ritual impurity has an exclusively restricted scope: "Not for kings in royal work, not for those under vows in their vow, not for sacrificers in a sacrificial session, not for craftsmen in craftsmanship." It is also said in the treatise of Śātātapa: