Shiva Purana
हृदयाद्यस्त्रपर्यंतमथवापि समर्चयेत् ॥ तद्बहिः पूर्वतः शक्रं यमं दक्षिणतो यजेत् ॥ ६ ॥
One should worship the Lord from the heart to the weapon. Outside that one should worship Indra on the east and Yama on the south.
english translation
hRdayAdyastraparyaMtamathavApi samarcayet ॥ tadbahiH pUrvataH zakraM yamaM dakSiNato yajet ॥ 6 ॥
hk transliteration by Sanscript