Answer

If you mean the oldest surviving Jain scripture, it is generally considered the Ācāranga Sūtra (Acharanga Sutra).

Explanation

• It is one of the earliest and most important texts in Jain tradition.
• It belongs to the Jain Āgamas, which preserve the teachings of Lord Mahavira.
• The Ācāranga Sūtra mainly teaches:

- right conduct, - non-violence, - discipline, - detachment, - and the Jain way of renunciation.

Spiritual Understanding

The Ācāranga Sūtra is highly respected because it reflects the foundation of Jain life: ahiṃsā, self-control, and pure conduct. In Jain Dharma, correct behavior is not just moral—it is part of the path to liberation.

Takeaway

So, in simple words:

• Oldest surviving Jain scripture: Ācāranga Sūtra
• Earliest source of Jain teachings: the sermons of Lord Mahavira

If you want, I can also tell you the 12 Angas of Jain scriptures in simple language.