Matsya Purana — Procedure for Going to Prayaga and the Greatness of the Ganga
तत्र दानं प्रकर्तव्यं यथाविभवसम्भवम् तेन तीर्थफलं चैव वर्धते नात्र संशयः स्वर्गे तिष्ठति राजेन्द्र यावदाभूतसंप्लवम् //
tatra dānaṃ prakartavyaṃ yathāvibhavasambhavam tena tīrthaphalaṃ caiva vardhate nātra saṃśayaḥ svarge tiṣṭhati rājendra yāvadābhūtasaṃplavam //
Therefore one should make gifts there, in accordance with one’s means and capacity. By that, the merit of the tīrtha‑pilgrimage indeed increases—of this there is no doubt. O best of kings, the giver abides in heaven until the cosmic dissolution.
It uses “saṃplava” (cosmic inundation/dissolution) as a time-measure for merit, stating the giver’s heavenly reward endures until pralaya.
It prescribes dana (charity) proportionate to one’s capacity—an ethical rule for householders and rulers alike—emphasizing that giving at a tirtha amplifies spiritual merit.
The ritual takeaway is tirtha-centered practice: charity performed at a sacred site is presented as a key ritual enhancer of “tirtha-phala,” though no specific vastu/temple-building rule is stated in this verse.