Answer

In Jain Dharma, the most sacred mantra related to the Tirthankaras is the Namokar Mantra, especially the line:

Namo Arihantanam I bow to the Arihants, including the Tirthankaras.

Explanation

Tirthankaras are not usually worshipped through a separate “mantra” for each one in the same way. Instead, Jain tradition honors them through:

• Namokar Mantra
• Namo Arihantanam — bowing to Tirthankaras and Arihants
• Their names, recited with devotion
• Stotras and stutis composed in praise of them

The Namokar Mantra is the most universal and revered Jain mantra:

• Namo Arihantanam
• Namo Siddhanam
• Namo Ayariyanam
• Namo Uvajjhayanam
• Namo Loe Savva-Sahunam

Spiritual Understanding

In Jainism, remembering the Tirthankaras means remembering:

• pure conduct
• complete victory over passions
• compassion
• liberation from karmic bondage

Their names are recited not as ordinary worship, but as a way to awaken respect, faith, and the desire for liberation.

Takeaway

If you are looking for the main Tirthankara-related mantra, remember this: Namo Arihantanam is the key line connected with the Tirthankaras, and the Namokar Mantra is the supreme Jain mantra.

If you want, I can also give you:

• the 24 Tirthankaras’ names
• the Namokar Mantra in Sanskrit/Prakrit
• or a simple meaning of each line