It will look like a scene out of a hospital ward.

In a basement room crowded with medical equipment, about 20 people at one time — sick, pregnant, frail and elderly, or on lifesaving medication — will be hooked up to intravenous drips on Wednesday to receive nutrients they need to get through the day.

The unlikely setting will be the main synagogue of the Bobov Hasidic sect, a cavernous house of worship in Borough Park, Brooklyn, that sets up hospital beds and intravenous drips in advance of the Jewish holiday of Yom Kippur. The patients will be frail Orthodox Jews trying to make it, with a little boost, through a day of religiously required fasting.

In recent years, hundreds of frail Jews have turned to intravenous feeding on Yom Kippur, which begins Tuesday at sundown and ends 25 hours later, to avoid violating the prohibition against eating on the holiest days of the Jewish calendar.

“It’s not considered eating if it goes through a vein,” said Yitzchok Fleischer, who inaugurated the program 10 years ago and has seen participation rise sharply. “You’re not supposed to take anything through the mouth or stomach. Anything. Even if you’re allowed to, nobody wants to eat.”