In Jainism, there is no single “first human birth” for a soul, because the soul is anadi — beginningless. It keeps wandering through the cycle of birth and death due to karma.

A human birth means the soul has taken birth in manushya gati after the rise and bondage of certain karmas. It is considered very precious, because only in human life can a soul properly practice dharma, self-discipline, and strive for moksha.

So, in simple words:

• A soul does not have one fixed first human birth
• Human birth happens when karmas permit
• It is rare and spiritually important in Jainism

If you want, I can also explain the 4 gatis in Jainism in a simple way.