Skandapurana 6.3.169.3

6.3.169.3

yudhiṣṭhira uvāca -
āścaryametallokeṣu yattvayā kathitaṃ mune .
na dṛṣṭaṃ na śrutaṃ tāta śūlasthena tapaḥ kṛtam .. 169.3 ..

Yudhiṣṭhira said: / This is a wonder in the worlds that you have recounted, O sage! / It has neither been seen nor heard of, dear father, that austerity was performed while fixed upon a stake.