Shiva Purana
एवं पश्चिमदिग्भागे शम्भोः षड्विंशकं शिवम् ॥ समभ्यर्च्योत्तरे पार्श्वे ततो वैकुंठमर्चयेत् ॥ ५५ ॥
After worshipping Śiva the lord of twenty-six principles thus to the west of Śiva, he shall worship Vaikuṇṭha in the northern side.
english translation
evaM pazcimadigbhAge zambhoH SaDviMzakaM zivam ॥ samabhyarcyottare pArzve tato vaikuMThamarcayet ॥ 55 ॥
hk transliteration by Sanscript