Answer

The first Devalok in Jain cosmology is Saudharma Devalok.

Explanation

In Jain tradition, the heavenly realms are called Devalokas. The first one is Saudharma, followed by Aishana and the others.

Spiritual Understanding

Jain teachings describe these realms as part of the cycle of birth and rebirth. Even the heavenly worlds are not the final goal. The true aim in Jain Dharma is liberation through right faith, right knowledge, and right conduct.

Takeaway

So, the first Devalok is Saudharma Devalok.