Are there any credible sources that mention intelligent extraterrestrial life and the existence of anything prior to our universe through tangible evidence?
It depends what you mean by 'credible sources'.
From a scientific perspective, this is a scientific question, and can be approached through scientific sources. (What one considers 'credible' about extraterrestrial life may vary from person to person.)
From the perspective of the study of the Qur'an and hadith, some ayat of the Qur'an have been interpreted (past and present) to suggest that there is extraterrestrial life. Some hadith also speak of life on other "earths". In particular, there are a number of Shi'i hadith on this theme, which one can find in sources like Bihar al-Anwar, vol. 55. One can also interpret the Qur'an and hadith to speak of life before/after this universe.
The following works in English may be useful:
* Islamic Theology and Extraterrestrial Life (book)
*Shīʿī Imāmī Thought on Existence, Life, and Extraterrestrials (article)
* A Broader Perspective on “Humans”: Analysis of Insān in Twelver Shīʿī Philosophy and Implications for Astrotheology (article)
This is a talk by myself in which I go through some of these ayat and hadith: https://www.youtube.com/live/nIcwpfkSbGw?si=Xp5S9o2lZ5j7cPBo