།ལྟུང་བཤགས།  Tungshak | His Holiness the Dalai Lama | Confession of Downfalls 

Sutra  of the Three Heaps (ཕུང་པོ་གསུམ་པའི་མདོ་) also known as the The  Bodhisattva’s Confession of Downfalls or Confession of Downfalls (Tung  Shak), a method of purifying transgressions of vows and downfalls of the  bodhisattva vow by invoking thirty-five buddhas of confession. Origin  of the Sutra A group of thirty-five monks who had taken the bodhisattva  vow and had accidentally caused the death of a child while they were out  begging for alms went to Upali, one of the closest disciples of the  Buddha, and asked him to request from the Buddha a method of confessing  and purifying what they had done. The Buddha then spoke this sutra, and  as he did so, light radiated from his body and thirty-four other buddhas  appeared in the space all around him. The thirty-five monks prostrated  before these buddhas, made offerings, confessed their misdeed, took  refuge and re-awakened bodhichitta. Note: This century old sacred prayer  is compiled with text and audio for the sole use and benefit of people.  It is not meant for any commercial purposes.

https://thongdrol.org/tungshak/