Peter called Paul’s writings scripture.
When?
And when did Jesus say to anybody during his earthly sojourn “write this down”?
2 Peter 3:16 as also in all his letters, speaking in them of these things, in which are some things hard to understand, which the untaught and unstable distort, as they do also the rest of the Scriptures, to their own destruction.
>>And when did Jesus say to anybody during his earthly sojourn “write this down”?<<
That really doesn't even deserve a response. The better question is, "when did God/Jesus stop requiring them to write it down?
Peter called Paul’s writings scripture.
When?
I just recently learned this myself, but Peter does mention Paul’s epistles in 2 Peter 3:15-16:
And account that the longsuffering of our Lord is salvation; even as our beloved brother Paul also according to the wisdom given unto him hath written unto you;
As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction.