One God abides deep in all beings - Brahmopanishad Chapter6 Verse11

एको देवः सर्वभूतेषु गूढः सर्वव्यापी सर्वभूतान्तरात्मा।
कर्माध्यक्षः सर्वभूताधिवासः साक्षी चेता केवलो निर्गुणश्च॥

eko debah sarba bhutesu gudhah sarba byaapi  sarba bhutaantaraatmaa
karmaadhykhyah sarba bhutaadhi baasah saakhi chetaa kebalo nirgunascha

(Brahmopanishad Chapter6 Verse11)

God, the shining supreme self, in all beings, remaining hidden, all-pervading and the Inner Self of all beings, controls and watches over all works, living in all creatures and the witness, the Supreme Intelligence, the one without a second has no attributes.