Narada Purana — Purva Bhaga, Shloka 86
Dharmopadeśa-Śānti: Rules of Impurity, Expiations, and Ancestor Rites
एकादशाहे प्रेतस्य यस्य चोत्सृज्यते वृषः । मुच्यते प्रेतलोकात्स स्वर्गलोके महीयते ॥ ८६ ॥
ekādaśāhe pretasya yasya cotsṛjyate vṛṣaḥ | mucyate pretalokātsa svargaloke mahīyate || 86 ||
死後第十一日に、亡き人のために儀礼として牡牛を放つならば、その者はプレータ界（preta-loka）より解き放たれ、天界において尊ばれる。
Sanatkumara (in dialogue with Narada)
Vrata: none
Primary Rasa: karuna
Secondary Rasa: shanta
FAQs
It teaches that vṛṣotsarga (ritual release/donation of a bull) performed on the ekādaśāha can help the departed move beyond the preta-state and attain honored status in svarga.
While focused on ritual dharma, it reflects bhakti-informed duty: relatives perform prescribed rites with faith and intention for the departed’s upliftment, aligning household action with sacred order.
Kalpa (ritual procedure) is implicit—timing (the 11th day), the specific act (vṛṣotsarga), and its stated fruit (release from preta-loka and heavenly honor).