it's found in "number in scripture", very thorough and very well for a long time accepted by believers as accurate with scripture.
it's far to lengthy to try to even cut and paste here, but it's readily available as a pdf online for free.
he proves beyond most any doubt that paul is the author, without any contradiction or even any conflict with scripture.
he also provides substantial evidence, scriptural, that if someone else is thought to be the author, then it causes contradictions and conflicts.
Can you link it? All I could find was "Numbers in Scripture", where he devotes a paragraph to the issue in terms of logical argument [bracketed components are my insertions]:
The following logical reasoning also supports the Pauline agency. There are four steps in the argument:—
- Peter wrote his First Epistle to the Diaspora, the Dispersion. See 1 Peter 1:1. [True]
- His Second Epistle was addressed to the same dispersed of Israel. See 2 Peter 3:1. [Questionable: Not clear the second letter is addressed to the diaspora, or indeed that 2 Peter 3:1 intends 1 Peter to be understood as the 'first' letter written to this audience to which 2 Peter is the quoted second. Did Peter only ever write two letters to Jewish people?]
- To these same he says (2 Peter 3:15) "our beloved brother Paul...hath written unto YOU."[Aside from the assumption that 2 Peter is to the diaspora, True]
- Where is this Epistle if it be not the one which is addressed to "the Hebrews"?[False conclusion: even if we take points 1-3 as true, it does not follow that there is no other letter that Paul wrote to Jews in the diaspora - Romans certainly counts as at least one. And, the biblical canon is not the entirety of what Paul wrote anyway. Finally and crucially, 2 Peter 3:16 says Paul wrote multiple letters, not just one - even if Peter has in mind the book of Hebrews as one of these letters, he also has in mind other letters Peter wrote to this audience has, which means it is impossible, by way of this argument, to demonstrate that Hebrews is the only possible candidate, out of Peter's own mouth.]
Bullinger then provides several paragraphs to the numbers argument, which is balony, because it relies on reducibility of numbers (i.e take a number, and show it is a multiple of 2, 3, 7, 10, 11, or 12, or show it is a squared or cubed root of one of those multiples = the whole thing is mathematically insignificant) and reduce it through any set of digits derived through selective data (i.e. cubed apparently spiritually signifies 3, not 100 - whereas squared signifies 10, not 2).