Bhagavad Gita 14.27

For I am the home of the spirit, the continual source of immortality, eternal righteousness, and infinite joy.

ब्रह्मणो हि प्रतिष्ठाऽहममृतस्याव्ययस्य च।शाश्वतस्य च धर्मस्य सुखस्यैकान्तिकस्य च॥

brahmaṇo hi pratiṣṭhā'hamamṛtasyāvyayasya ca|śāśvatasya ca dharmasya sukhasyaikāntikasya ca||

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