Bhagavad Gita · 4.24

ब्रह्मार्पणं ब्रह्म हविर्ब्रह्माग्नौ ब्रह्मणा हुतम्।ब्रह्मैव तेन गन्तव्यं ब्रह्मकर्मसमाधिना॥

brahmārpaṇaṁ brahma havir brahmāgnau brahmaṇā hutam brahmaiva tena gantavyaṁ brahma-karma-samādhinā

For one who sees Brahman in the offering, Brahman in the oblation, Brahman in the sacred fire, and the act of offering as Brahman — such a person, absorbed in Brahman through every action, attains Brahman alone.

— Bhagavad Gita 4.24

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)