Answer

Yes, after completing Atthai, you may take nimbu pani only when your Parna/Paina has properly begun, according to your family’s or Jain tradition’s method.

Usually, after long tapasya like Atthai, one should not casually drink anything before the proper Parna vidhi.

Explanation

In Jain practice, after completing a fast, the fast is broken respectfully through Parna. Traditionally, this is done with suitable food or drink as guided by elders, guru bhagwant, or family custom.

For health reasons also, after Atthai, the body is weak, so one should avoid taking strong or excessive lemon water suddenly. If nimbu pani is taken, it should generally be:

• mild, not too sour
• not too cold
• taken slowly
• preferably after proper Parna has started

Spiritual Understanding

Atthai is a great tapasya. Its completion should be done with awareness, humility, and proper maryada. Parna is not just eating or drinking; it is a respectful completion of tapasya.

Takeaway

Do not drink nimbu pani casually before proper Parna/Paina. First follow the correct Parna method advised by your elders or guru, then take mild nimbu pani slowly if suitable for your health.