Some major Persian literary texts survived the Arab invasion of the seventh century because they had been transliterated into Hebrew.

The full Old Persian text can be found with English translation here:

The original Persian text was translated into English in three volumes.

The first reference to an Iranian origin dates to an 18th-century Persian text.

The school of Herst, notably, still regularly produces copies of great illustrated Persian texts.

Halhed translated the Persian text to English closely attended by Hastings himself.

The full Persian text exists, with an English translation & transliteration.

A systematic association is only present in later middle Persian texts, where each of the seven is listed with its "special domain":

According to the legend mentioned in historical Persian texts, this lake dried out on the night of the birth of Muhammad.

Most scholars agree that nothing can compare to a complete and fresh translation from the original Persian text.