Brahma Sutras
ॐ त्रयाणामेव चैवमुपन्यासः प्रश्नश्च ॐ ॥ १-४-६॥
And thus there is the presentation of three things alone and the question also is concerned with them.
english translation
OM trayANAmeva caivamupanyAsaH praznazca OM ॥ 1-4-6॥
hk transliteration by Sanscript