Answer

In general, ek tithi means one tithi or one lunar date, while be tithi means two tithis or two lunar dates.

Explanation

In Jain usage, a tithi is the lunar date in the traditional Jain calendar.

• Ek tithi:

A practice, observance, or fast connected with one specific tithi.

• Be tithi:

A practice, observance, or fast connected with two tithis.

So the basic difference is:

• Ek tithi = one tithi
• Be tithi = two tithis

Spiritual Understanding

The idea behind tithi-based observance is to follow the Jain calendar with care and discipline.

• Ek tithi observance is simpler and shorter.
• Be tithi observance is more extended and requires greater restraint.

In Jain Dharma, such observances help cultivate:

• self-control
• mindfulness
• detachment
• devotion to spiritual discipline

Takeaway

Ek tithi means one tithi, and be tithi means two tithis. If you want, I can also explain this in the context of fasting, paryushan, or Jain panchang.