Shiva Purana
सद्यादीशानपर्य्यंतान्यकारादिषु पंचसु ॥ स्थितानि पंच ब्रह्माणि तानि मन्मूर्त्तयः क्रमात् ॥ २६॥
The five Brahmans beginning with Sadya and ending with Īśāna are stationed in the five letters ‘A’ etc. They are my very forms in order.
english translation
sadyAdIzAnaparyyaMtAnyakArAdiSu paMcasu ॥ sthitAni paMca brahmANi tAni manmUrttayaH kramAt ॥ 26॥
hk transliteration by Sanscript