Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 153.10

153.10

sapta janmāni tānyeva dadātyarkaḥ punaḥ punaḥ /
śatamindukṣaye dānaṃ sahasraṃ tu dinakṣaye //

For seven lifetimes the Sun gives those very things again and again.
A gift on the new moon is hundredfold, but on a solar eclipse, thousandfold;