You likely mean the “Nirdhūma Varti” śloka from the Bhaktāmara Stotra.

Original (Sanskrit): निर्धूम वर्तिरपवर्जित तैलपूरः कृत्स्नं जगत्त्रयमिदं प्रकटीकरोषि। गम्यो न जातु मरुतां चलिताचलानां दीपोऽपरस्त्वमसि नाथ जगत्प्रकाशः॥

Saral arth (traditional Jain meaning):

• O Nath (Jinendra), like a lamp whose wick burns smokeless and whose oil never diminishes, you illuminate the entire three worlds.
• No winds can shake you; you are the unfailing, steady light.
• You are the peerless lamp that dispels the darkness of ignorance and reveals the true path to all beings.

Notes:

• This verse is part of the Bhaktāmara Stotra, revered by both Digambar and Shvetambar traditions. The meaning is the same; minor textual accents/pauses may vary in recitation.
• The core intent is praise of the Jina as the eternal, unobstructed light of right knowledge that removes delusion without any worldly impurity (smoke, oil loss, or disturbance).