Matsyapurana 79.13

79.13

anena vidhinā yastu kuryānmandārasaptamīm
vipāpmā sa sukhī martyaḥ kalpaṃ ca divi modate //

One who observes this Mandâra Saptamî fast in this way is freed from all sins and goes to heaven where he resides for a kalpa. This ordinance is like a torch that dispels all the sins like pitched darkness. One who keeps it up gets his desires fulfilled. One who reads or listens about this ordinance becomes freed from all sins.—13-15.