Arahant Upatissa - Vimuttimagga - Path of Freedom

https://www.buddhism.hku.hk/publication-post/the-path-to-freedom-vimuttimagga/

Probably written in Pāli in Sri Lanka during the first century AD, the Vimuttimagga survived only in Chinese translation, from which the present rendering has been made. Ascribed to the Arahant Upatissa, the work is a meditation manual similar to the later Visuddhimagga, less analytical and more practical in its treatment of meditation.

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