The Vimuttimagga ("Path of Freedom") is a Buddhist practice manual, traditionally attributed to the Arahant Upatissa (c. 1st or 2nd century[1]).
It was translated into Chinese in the sixth century as the Jietuo dao lun 解脫道論 by Sanghapala.
The original text (possibly Pali or Buddhist Hybrid Sanskrit) is no longer extant, but the work has survived in Chinese.
[1] Some doctrines of the Vimuttimagga have been associated with those attributed to the Abhayagiri monastery by Dhammapāla, but this has been disputed in recent scholarship.
According to Bhikkhu Analayo, the Chinese version of the Vimuttimagga states that ascetic practices (dhutanga) can be unwholesome and wholesome while the Visuddhimagga denies that they can be unwholesome, although he notes that the Tibetan Vimuktimārga classifies ascetic practices as "wholesome".