Skandapurana 6.3.168.22

6.3.168.22

vareṇa chandayāmāsa rākṣasaṃ vṛṣaketanaḥ .
varaṃ vṛṇīṣva bhadraṃ te tava dāsyāmi suvrata .. 168.22 ..

The bull-bannered Lord invited the rākṣasa to choose a boon: / “Choose a boon, may good betide you; I shall grant it to you, O man of firm vows.”