Matsya Purana — Kailasa
अनेन तोषितश्चाहं नद्यर्थे पूर्वमेव तु बुद्ध्वाऽस्य वरदानं तु ततः कोपं न्ययच्छत //
anena toṣitaścāhaṃ nadyarthe pūrvameva tu buddhvā'sya varadānaṃ tu tataḥ kopaṃ nyayacchata //
By this, I was indeed gratified earlier in the matter of the river; and, realizing that he had already granted a boon, he thereafter restrained his anger.
This verse does not describe Pralaya; it highlights ethical restraint—after a boon is given, anger is checked—within a river-related narrative context.
It underscores dharma as self-control and fidelity to one’s word: once a boon/promise is granted, one should not be driven by anger to revoke or violate it—an essential discipline for rulers and householders alike.
No direct Vāstu or temple rule is stated; the closest ritual takeaway is the principle that proper acts which ‘please’ (toṣita) can secure favorable outcomes, while restraint preserves the sanctity of vows/boons.