Chapter 10 · The Divine Glories · Krishna said
Bhagavad Gita 10.33 — The letter A and endless time
अक्षराणामकारोऽस्मि द्वन्द्वः सामासिकस्य च। अहमेवाक्षयः कालो धाताहं विश्वतोमुखः ॥
akṣarāṇāmakāro'smi dvandvaḥ sāmāsikasya ca | ahamevākṣayaḥ kālo dhātāhaṃ viśvatomukhaḥ ||
Meaning
Among letters I am "A", and among word-compounds I am the pairing kind (dvandva). I alone am endless time, and I am the creator who faces every direction.