O lord, you are the original source of Vedic literature. You are the original cause of material creation, the life force, the senses, the five elements, the three modes and the mahat-tattva. You are eternal time, determination and the two religious systems called truth [satya] and truthfulness [ṛta]. You are the shelter of the syllable om, which consists of three letters a-u-m.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
त्वं शब्दयोनिर्जगदादिरात्मा प्राणेन्द्रियद्रव्यगुणस्वभावः । कालः क्रतुः सत्यमृतं च धर्म- स्त्वय्यक्षरं यत्त्रिवृदामनन्ति
tvaṃ śabdayonirjagadādirātmā prāṇendriyadravyaguṇasvabhāvaḥ | kālaḥ kratuḥ satyamṛtaṃ ca dharma- stvayyakṣaraṃ yattrivṛdāmananti
SB 8.7.25