Upaniṣads · Bṛhadāraṇyaka 5.3

Bṛhadāraṇyaka 5.3.1

एष प्रजापतिर्यद्धृदयम् ।
एतद्ब्रह्म ।
एतत्सर्वम् ।
तदेतत्त्र्यक्षरं हृदयमिति ।
हृ इत्येकमक्षरम् ।
अभिहरन्त्यस्मै स्वाश्चान्ये च य एवं वेद ।
द इत्येकमक्षरम् ।
ददत्यस्मै स्वाश्चान्ये च य एवं वेद ।
यमित्येकमक्षरम् ।
एति स्वर्गं लोकं य एवं वेद ॥ ५.३.१ ॥

This is Prajāpati, which is the heart; this is brahman; this is all. This heart is three-syllabled: "hṛ" is one syllable. Those who know it thus are approached by their own people and others. "da" is one syllable. Those who know it thus are given gifts by their own people and others. "yam" is one syllable. Whoever knows it thus goes to the heavenly world.