Skandapurana 5.167.7

5.167.7

.. iṃdra uvāca .. ..
viśvāmitra pratuṣṭo'smi tapasānena pārthiva ..
varaṃ varaya bhadraṃ te yadabhīṣṭaṃ hṛdisthitam.. 7 ..

Indra said:
“O Viśvāmitra! I am well pleased with this austerity, O king.
Choose a boon—may it be well with you—whatever desired thing is in your heart.”