Kurma Purana — Uttara Bhaga, Shloka 30
Aśauca-vidhi — Rules of Birth/Death Impurity, Sapinda Circles, and Śrāddha Sequence
आदन्तात् सोदरे सद्य आचौलादेकरात्रकम् / आप्रदानात् त्रिरात्रं स्याद् दशरात्रमतः परम्
ādantāt sodare sadya ācaulādekarātrakam / āpradānāt trirātraṃ syād daśarātramataḥ param
对于同父同母之亲兄弟姊妹（sodara），不净即刻成立。自未萌齿之期至初次剃顶礼（cūḍā）之间，为一夜；至正式“交付”之礼（pradāna）为三夜；其后则为十夜。
Sūta (narrating traditional dharma-vidhi taught by sages in the Kurma Purana context)
Primary Rasa: shanta
Secondary Rasa: karuna
FAQs
This verse is primarily dharma-śāstra in tone, prescribing ashauca durations; indirectly it supports spiritual discipline by regulating purity observances that steady the mind and prepare one for higher inquiry into Ātman taught elsewhere in the Kurma Purana.
No direct yogic technique is taught; the focus is preparatory discipline (niyama-like regulation) through ashauca timings connected to saṃskāras, which helps maintain ritual order conducive to mantra, worship, and later yogic practice.
It does not explicitly mention Shiva–Vishnu unity; it reflects the Purana’s broader synthesis by grounding spiritual life in dharma (purity and saṃskāra order), a foundation shared across Śaiva and Vaiṣṇava traditions before higher teachings like the Ishvara Gita.