Skandapurana 16.81.49

16.81.49

kanyāsahasraṃ vidhivaddadāti ratnairalaṃkṛtya svadharmabuddhyā ..
gavāṃ sahasraṃ kurujāṃgale tu teṣāṃ paraṃ jāgaraṇena viṣṇoḥ .. 49 ..

If one gives a thousand maidens in marriage according to rule, adorned with jewels, with the thought of fulfilling one's duty, / or a thousand cows in the land of Kurujāṅgala, superior to those is keeping vigil for Viṣṇu.