Skandapurana 1.3.13.79

1.3.13.79

tasmānna yogyo prahasya covāca bṛhaspatimakalpaṇaṣam..
asau na paripūrṇo hi yajñaiḥ śakrāsane sthitaḥ..
avāhyavāhanenaiva atrāgatya labheta mām.. 15.79 ..

Therefore he is not fit […] / He, seated upon Śakra’s throne, is not fulfilled with sacrifices; / only by coming here upon a mount not to be ridden may he obtain me.”