Shiva Purana
मध्ये देवीं स्थापयित्वा पञ्चायतनदेवताः ॥ चतुर्द्दिक्षु स्थापयेद्यस्तस्य पुण्यं न गण्यते ॥ २७॥
The merit cannot be calculated of the man who installs the Pañcāyatana deities with Ambikā in the centre and the other four in the four quarters.
english translation
madhye devIM sthApayitvA paJcAyatanadevatAH ॥ caturddikSu sthApayedyastasya puNyaM na gaNyate ॥ 27॥
hk transliteration by Sanscript