Manava Dharmashastra 5.136

5.136

mūtrotsargadeśānmūtrādisambandhān kṛtvā śodhayitvā yathoktena vidhinā | ācāntaḥ khāni indriyāṇi upaspṛśet | vedamadhyeṣyamāṇaśca dvitīye svādhyāyavidhau | prāthamikārthatvātkaroteḥ 'kṛtvā' utsṛjyeti pratīyate | utsṛjya mūtraṃ purīṣaṃ ca pāyūṃpasthaṃ kṣālayitvā ācāmet | 'vedamadhyeṣyamāṇaśca', svādhyāyavidherdharmatayoktaṃ'adhyeṣyamāṇastvācānta' iti | idaṃ tvadhyāpayato'dhyeṣyato vā | anyathā 'vedamūdāharanta' ucyante | laukikāni kriyāntarāṇi kṛtvā nānācānto vedākṣarāṇyuccārayet |

Medhātithi’s commentary (manubhāṣya):
Having ‘passed’—i.e., cleansed away according to the aforesaid directions,—all taint of urine &c., from the urinary organ, etc.;—‘and sipped water,’—‘one should touch with water the cavities’.

‘Also when he may be going to read the Veda’—i.e., according to the course of Vedic study preserved in Discourse II.

In accordance with its primary signification, the word ‘kṛtvā’, ‘having passed appears to mean ‘having evacuated’; and the meaning is that—‘after having passed urine and faeces and washed the anus and the urinary organ, one should sip water’.

‘Also when going to read the Veda;’—the sipping of water has been prescribed as a necessary duty in connection with the course of Vedic study, under 2.70. What is prescribed here is meant for all sorts of reading of the Veda—either by one who is teaching it, or reading it. In other cases, people are said to be ‘reciting’ the Veda (udaharantaḥ). The meaning is that after having done other secular acts, one should not pronounce the words of the Veda, without having sipped water.

‘Also when going to take food.’ (136).