Mahabharata — Anushasana Parva, Shloka 53
भीष्मस्योत्तरायणप्रतीक्षा तथा युधिष्ठिरागमनम् | Bhīṣma’s uttarāyaṇa moment and Yudhiṣṭhira’s arrival
तत्र च त्रितयं दृष्टं भविष्यति न संशय: । समस्ता हि वयं देवास्तस्य देहे वसामहे
tatra ca tritayaṁ dṛṣṭaṁ bhaviṣyati na saṁśayaḥ | samastā hi vayaṁ devās tasya dehe vasāmahe ||
于彼处，必得见神圣三位一体（梵天、毗湿奴、湿婆）之圣观，毫无疑虑。因为我等诸天皆住于其身；故观见彼一神，即亦观见三神。
ईश्वर उवाच
Educational Q&A
The verse teaches the unity of divine presence: when the divine is truly embodied in a single revered form, beholding that form is equivalent to beholding the triad of Brahmā, Viṣṇu, and Śiva. It emphasizes faith (freedom from saṁśaya) and a non-sectarian vision of divinity.
Īśvara declares that in the person being spoken about, all the gods reside. Hence, a devotee who gains his darśana simultaneously gains the darśana of the three principal deities, and this is asserted as certain (na saṁśayaḥ).