Shiva Purana
वह्नौ वा स्थण्डिले वाथ भक्त्या वित्तानुसारतः ॥ अथवांतर्बहिश्चैव पूजयेत्परमेश्वरम् ॥ अंतर्यागरतः पूजां बहिः कुर्वीत वा न वा ॥ ६१ ॥
One may offer oblations to the fire or to the ground with devotion according to one’s means. Or else one should worship the Supreme Lord inside and outside. Whether one should perform worship outside the inner chamber or not.
english translation
vahnau vA sthaNDile vAtha bhaktyA vittAnusArataH ॥ athavAMtarbahizcaiva pUjayetparamezvaram ॥ aMtaryAgarataH pUjAM bahiH kurvIta vA na vA ॥ 61 ॥
hk transliteration by Sanscript