Answer

“Pura halrda” does not appear to be a clearly established Jain term, mantra, sutra, stotra, or commonly known Jain phrase.

Sorry, I can only provide information that is clearly established within Jain tradition.

Clarification

If you can share:

• the exact spelling,
• the language — Prakrit, Sanskrit, Hindi, Gujarati, etc.,
• where you heard or read it,
• or the full line/mantra,

I can help explain it if it belongs to Jain Dharma.