Answer

The one rule King Shrenik observed properly was the vow of not eating at night — Ratri-bhojan tyag.

Explanation

In Jain tradition, King Shrenik had deep faith in Bhagwan Mahavir. Although he had many karmic limitations and was destined to go to hell due to past karmas, he sincerely observed the rule of giving up food at night.

This proper observance of Ratri-bhojan tyag became a powerful cause for his future spiritual rise. Jain tradition says that King Shrenik will become a future Tirthankar in the next time cycle.

Spiritual Understanding

In Jain Dharma, even one rule practiced with sincerity, faith, and discipline can become spiritually powerful.

The rule of not eating at night helps in:

• Practicing self-control
• Reducing harm to subtle living beings
• Strengthening awareness and restraint
• Building punya and spiritual discipline

Takeaway

King Shrenik’s example teaches that sincere practice of even one Jain vow can create a strong foundation for future liberation and spiritual greatness.