user20115: Can beings that have come into existence that have never been reborn before, like comes into existence without that existence being a rebirth, or "its first birth".
Or is every being's existence a rebirth and nothing new can be "created".
Like a set number of souls or spirits that just recycle through rebirth
no new souls/spirits can be created and start the cycle?

user471: The beginnings of samsara and the precise working out of kamma is basically unknown, unknowable and may bring madness and vexation to anyone speculating on them.

Transmigration (samsara) has no known beginning.
No first point is found of
sentient beings roaming and transmigrating, hindered by ignorance and
fettered by craving. For such a long time you have undergone
suffering, agony, and disaster, swelling the cemeteries. This is quite
enough for you to become disillusioned, dispassionate, and freed
regarding all conditions.
SN 15.3 (translated by Ven. Sujato)


From an inconstruable beginning comes transmigration (samsara).
A beginning
point is not evident, though beings hindered by ignorance and fettered
by craving are transmigrating & wandering on. Long have you thus
experienced stress, experienced pain, experienced loss, swelling the
cemeteries—enough to become disenchanted with all fabricated things,
enough to become dispassionate, enough to be released.
SN 15.3 (translated by Ven. Thanissaro)


"The [precise working out of the] results of kamma is an
unconjecturable that is not to be conjectured about, that would bring
madness & vexation to anyone who conjectured about it.
"Conjecture about [the origin, etc., of] the world is an
unconjecturable that is not to be conjectured about, that would bring
madness & vexation to anyone who conjectured about it.
AN 4.77 (translated by Ven. Thanissaro)


20115: <p>Can beings that have come into existence that have never been reborn before, like comes into existence without that existence being a rebirth, or &quot;its first birth&quot;.</p>
<p>Or is every being's existence a rebirth and nothing new can be &quot;created&quot;.</p>
<p>Like a set number of souls or spirits that just recycle through rebirth
no new souls/spirits can be created and start the cycle?</p>
 471: <p>The beginnings of <em>samsara</em> and the precise working out of <em>kamma</em> is basically unknown, unknowable and may bring madness and vexation to anyone speculating on them.</p>
<blockquote>
<p>Transmigration (<em>samsara</em>) has no known beginning.
No first point is found of
sentient beings roaming and transmigrating, hindered by ignorance and
fettered by craving. For such a long time you have undergone
suffering, agony, and disaster, swelling the cemeteries. This is quite
enough for you to become disillusioned, dispassionate, and freed
regarding all conditions.<br />
<a href="https://suttacentral.net/sn15.3/en/sujato" rel="nofollow noreferrer">SN 15.3</a> (translated by Ven. Sujato)</p>
</blockquote>
<blockquote>
<p>From an inconstruable beginning comes transmigration (<em>samsara</em>).
A beginning
point is not evident, though beings hindered by ignorance and fettered
by craving are transmigrating &amp; wandering on. Long have you thus
experienced stress, experienced pain, experienced loss, swelling the
cemeteries—enough to become disenchanted with all fabricated things,
enough to become dispassionate, enough to be released.<br />
<a href="https://suttacentral.net/sn15.3/en/thanissaro" rel="nofollow noreferrer">SN 15.3</a> (translated by Ven. Thanissaro)</p>
</blockquote>
<blockquote>
<p>&quot;The [precise working out of the] results of <em>kamma</em> is an
unconjecturable that is not to be conjectured about, that would bring
madness &amp; vexation to anyone who conjectured about it.</p>
<p>&quot;Conjecture about [the origin, etc., of] the world is an
unconjecturable that is not to be conjectured about, that would bring
madness &amp; vexation to anyone who conjectured about it.<br />
<a href="https://www.accesstoinsight.org/tipitaka/an/an04/an04.077.than.html" rel="nofollow noreferrer">AN 4.77</a> (translated by Ven. Thanissaro)</p>
</blockquote>
