Bhagavad Gita 10.8

I am the source of all; from me everything flows. Therefore, the wise worship me with an unchanging devotion.

अहं सर्वस्य प्रभवो मत्तः सर्वं प्रवर्तते।
इति मत्वा भजन्ते मां बुधा भावसमन्विताः॥

ahaṃ sarvasya prabhavo mattaḥ sarvaṃ pravartate|
iti matvā bhajante māṃ budhā bhāvasamanvitāḥ||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).