Skandapurana 2.4.3.88

2.4.3.88

kuryātkārtikamāse'sau viṣṇulokaṃ prayāsyati .. 42 .. *
aśvattharūpī bhagavānvaṭarūpī sadāśivaḥ ..

in the month of Kārtika, will go to Viṣṇu's world. // 42 // *
The Blessed One has the form of the aśvattha; Sadāśiva has the form of the vaṭa;