DOHA, QATAR • For a brief moment after Saudi Arabia’s Salem Aldawsari fired a ball from just inside the penalty box into the back of the net to seal a World Cup win against Argentina, Arabs across the divided Middle East found something to celebrate.

Such Arab unity is hard to come by and fleeting when it arrives. But Qatar’s hosting of the World Cup has provided a moment where many in the Arab world have rallied by Doha and the Saudi team’s win.

Whether that momentum continues will be tested on Saturday as Saudi Arabia faces Poland — and as regional tensions, religious differences and renewed economic competition between countries resume.

“All Arabic countries are celebrating because one Arab team won,” said 27-year-old Saudi Rakan Yousef after Arab fans congratulated him in Doha, Qatar, on the Green Falcons’ win. “Even the emir of Qatar attended our match. ... There’s this feeling now that we are all brothers. That’s why I’m speechless.”

The Arab world’s division start even with the Arabic language.

Spoken Arabic changes regionally, with the Berber-infused Arabic of North Africa, the rapid-fire Egyptian heard in movies and television comedies, the soft Levantine drawl and the guttural dialect of the Gulf Arabs.

Religion is another differentiator — there are Muslims, both Sunni and Shiite with subgroups within, and minority Christians, Druze, Baha’i and others. Different views on religion and regional rivalries bleed into conflicts, such as the ongoing war in Yemen.

Despite an attempt by al-qaida to stir up extremists, the monthlong World Cup in energy-rich Qatar so far has seen unity among the Gulf Arab nations. Saudi Crown Prince Mohammed bin Salman and Egyptian President Abdel Fattah el-sissi, the heads of state in two countries that only some two years ago had boycotted Qatar, attended the opening match.

Dubai’s ruler, Sheikh Mohammed bin Rashid Al Maktoum, called Qatar’s hosting of the tournament “a milestone for all Arabs” and also attended the opening. That feeling was shared by others as well.

“We are proud to be here for the first World Cup in an Arabic country,” Morocco coach Walid Regragui said.

Jordan’s Foreign Minister Ayman Safadi similarly praised Qatar while dismissing the criticisms of journalists — and by extension, rights groups.

“Qatar did a tremendous job organizing a World Cup. ... Qatar never claimed it was perfect,” Safadi said. “We have differences in opinion, we have differences in views but that should not take away from the fact that Qatar has really put together a World Cup that is unique in every sense of the word.”

But the biggest surprise came two days later as Saudi Arabia stunned Argentina by winning their opener in the tournament, with Aldawsari doing a cartwheel and a flip. Qatar’s ruling emir, Sheikh Tamim bin Hamad Al Thani, attended the match and wore a Saudi flag.

One veteran Saudi sports journalist, Majed al-tuwaijri, even wept on air after the match.

“This is the most beautiful and important moment in my life and my 30-year media career,” he said, his voice choking up.