In Jainism, the term "Dev Guru" can be interpreted in the context of spiritual guidance and the concept of reverence. Here’s how these terms are understood:

1. Dev (Deva): In Jainism, "Dev" generally refers to celestial beings or heavenly souls residing in higher realms due to their accumulated good karma. However, Jains do not worship these devas for liberation, as devas themselves are still in the cycle of birth and death (samsara) and are not liberated souls.

1. Guru: A "Guru" in Jainism is a spiritual teacher or guide, especially one who imparts knowledge about the true path (right faith, right knowledge, and right conduct). The Guru is highly respected, as they help aspirants understand Jain scriptures (Agamas) and progress spiritually.

1. Namokar Mantra: The central prayer in Jainism, the Namokar (Navkar) Mantra, pays obeisance to five supreme beings:

- Arihant (the liberated conquerors) - Siddha (the fully liberated souls) - Acharya (spiritual leaders of the Jain order) - Upadhyaya (preceptors/teachers) - Sadhu (monks and nuns)

Here, the Acharya, Upadhyaya, and Sadhu are considered types of Gurus.

Worship in Jainism: Jains primarily worship the Arihants and Siddhas, who are liberated souls, and they deeply respect Acharyas, Upadhyayas, and Sadhus as Gurus. The Namokar Mantra itself is a form of salutation to these beings, acknowledging their spiritual achievement and guidance.

Summary: In Jainism, while "Dev" refers to celestial beings, true spiritual guidance comes from the "Guru"—the Acharyas, Upadhyayas, and Sadhus. However, the ultimate goal is to seek liberation by following the teachings of Tirthankaras and respecting these enlightened beings, rather than worshipping devas for material gain.

If you meant something more specific by "Dev guru," please provide more context related to Jainism.