Parsva Ekadashi Significance - Glories, Benefits of Fasting

one should closely observe Parivartini Ekadasi. It does purge one of all sinful reactions because it is particularly purifying. If possible, one should give a qualified person some yoghurt mixed with rice and silver on this day and then remain awake throughout the night.

https://iskcondwarka.org/blogs/parsva-ekadashi-significance/