Any good (AUTHENTIC) books to read about Sufi mysticism/poetry?

Does anyone know any good translated and authentic books from Classical scholars to read about Sufi mysticism and poetry? I'm aware that the English translations for a lot of Sufi works, like from Rumi, have been heavily mistranslated and misinterpreted by Western Orientalists to fit their existing worldview.

Oftentimes, people seem to heavily misunderstand what Sufism is, and before I opened up my mind more, I thought all Sufis were deviants, so I would like to read about actual Sufis in the past, who both mastered Shariah and upheld Tawassuf and, most importantly, did not deviate from Islamic teachings nor fall into shirk.

This Shaykh right here, I think, best explained what a true Sufi is: https://seekersguidance.org/answers/general-counsel/was-sufism-recommend-by-the-prophet/

Forgive me if I sound ignorant. I am an Ex-Salafi and trying to learn the way of the true Sufis like Al-Ghazali... so it'd be very much appreciated if I could read authentic works about actual Sufism and spiritual purification, good character, and excellence.

Imam Ash-Shafi’i said “I accompanied the Sufis, I only learned from them two words (and according to another narration: only three words). Their affirmation: time is like a saber, if you do not slice it, it will cut you off. And their affirmation: if you do not occupy your mind with the truth, it will occupy you with error. And their word: deprivation is a protection.” Ta’yid al-haqiqah al-aliyyah, by Suyuti.

And the righteous Imam also said: “Three things were made beloved to me from your world: abandoning affectation, interacting with the creation with gentleness, and conforming to the way (Tariq) of the people of tasawwuf.” Kashf al-Khafa’: al-Ajluni 1/341

Imam Malik said “Whoever learns Fiqh (jurisprudence) without being initiated into Tasawwuf corrupts himself. And anyone who initiates Tasawwuf without being initiated into Fiqh corrupts his religion. Whoever combines the two reaches the Truth.” Haqaiq an at-tasawwuf, By Abd-Al-Qadir Isa.