Muslim authorities in Saudi Arabia and several other Middle Eastern countries say this year’s fasting month of Ramadan will begin Thursday based on the expected sighting of the crescent moon.

Clerics across the region said the moon was not visible Tuesday night, meaning it will almost certainly appear the following evening, heralding the start of the monthlong observance.

The fasting is aimed at bringing the faithful closer to God and reminding them of the suffering of the poor. Muslims are expected to strictly observe daily prayers and engage in heightened religious contemplation. They are also urged to refrain from gossip, fighting or cursing during the holy month.

Islam follows a lunar calendar, so Ramadan begins around a week and a half earlier each year. At the end of Ramadan, Muslims celebrate the joyous Eid al-Fitr holiday, when children often receive new clothes and gifts.