Manusmriti

siva.sh/manusmriti/4/119

उपाकर्मणि चोत्सर्गे त्रिरात्रं क्षेपणं स्मृतम् । अष्टकासु त्वहोरात्रं ऋत्वन्तासु च रात्रिषु ॥ ११९ ॥

sanskrit

On (the occasion of) the Upakarman and (of) the Vedotsarga an omission (of the Veda-study) for three days has been prescribed, but on the Ashtakas and on the last nights of the seasons for a day and a night.

english translation

upAkarmaNi cotsarge trirAtraM kSepaNaM smRtam | aSTakAsu tvahorAtraM RtvantAsu ca rAtriSu || 119 ||

hk transliteration by Sanscript