Skandapurana 16.221.17

16.221.17

evamuktvā sa bhagavāṃstatraivāntaradhīyata ..
tasmātsarvaprayatnena tatra śrāddhaṃ samācaret ..
pūjayettanmahādevi pitṛliṃgaṃ surapriyam .. 17 ..

Having spoken thus, the Blessed Lord vanished right there.
Therefore, with every effort one should perform a śrāddha there,
and worship that liṅga dear to the gods, the pitṛliṅga, O great goddess."