Matsya Purana — Ritual Bathing
ये ऽबान्धवा बान्धवा वा ये ऽन्यजन्मनि बान्धवाः ते तृप्तिमखिलां यान्तु यश् चास्मत्तो ऽभिवाञ्छति //
ye 'bāndhavā bāndhavā vā ye 'nyajanmani bāndhavāḥ te tṛptimakhilāṃ yāntu yaś cāsmatto 'bhivāñchati //
May those who are not our relatives, and those who are our relatives, and those who were our relatives in another birth—may all of them attain complete satisfaction; and likewise, whoever seeks a share from us, may they too be fully gratified.
This verse does not describe pralaya; it reflects ritual ethics—offerings are intended to satisfy all categories of beings connected to the performer, even across births.
It supports the householder/kingly duty of śrāddha and charitable offering: one should dedicate the rite broadly—kinsmen, non-kinsmen, and past-life relations—so the merit and satisfaction are not narrowly restricted.
The significance is ritual (not architectural): it functions as a dedicatory prayer (saṅkalpa-like intent) that the libation/food-offering should grant full satisfaction to all who have a legitimate claim or expectation from the performer.