strict fast

And it all came from a player who has spent recent weeks managing a strict fast from dawn until sunset to observe Ramadan as a Muslim.

From Seattle Times ● Apr. 3, 2023

The three are Muslims who observe Ramadan and began a strict fast from dawn until sunset daily starting March 22 and continuing through April 20.

From Seattle Times ● Mar. 31, 2023

A strict fast is observed during the day.

From Bible Myths and their Parallels in other Religions Being a Comparison of the Old and New Testament Myths and Miracles with those of the Heathen Nations of Antiquity Considering also their Origin and Meaning by T. W. Doane

This is followed by a strict fast of eight days, in which they totally abstain from food, but during which the day is passed in continual song.

From Illustrative Anecdotes of the Animal Kingdom by Samuel G. (Samuel Griswold) Goodrich

Stafford did not appear, pleading that it was a Friday, and a strict fast for him.

From Father Stafford by Anthony Hope