Skandapurana 1.4.37.96

1.4.37.96

yadi tuṣṭo'si deveśa yadi deyo varo mama..
sāṃnidhyaṃ kriyatāmatra sarvakālaṃ hi śaṃkara.. 39.96 ..

“If you are pleased, O Lord of gods, if a boon is to be granted to me, / then establish your presence here for all time, O Śaṃkara.”