In the midst of the heated debate about the construction of an Islamic center two blocks away from the site of the World Trade Center, Samuel Freedman tells a story that should be heard by everyone who has declared their concern about the sensitivity of this issue.

Sometime in 1999, a construction electrician received a new work assignment from his union. The man, Sinclair Hejazi Abdus-Salaam, was told to report to 2 World Trade Center, the southern of the twin towers.

In the union locker room on the 51st floor, Mr. Abdus-Salaam went through a construction worker’s version of due diligence. In the case of an emergency in the building, he asked his foreman and crew, where was he supposed to reassemble? The answer was the corner of Broadway and Vesey.

Over the next few days, noticing some fellow Muslims on the job, Mr. Abdus-Salaam voiced an equally essential question: “So where do you pray at?” And so he learned about the Muslim prayer room on the 17th floor of the south tower.

He went there regularly in the months to come, first doing the ablution known as wudu in a washroom fitted for cleansing hands, face and feet, and then facing toward Mecca to intone the salat prayer.

On any given day, Mr. Abdus-Salaam’s companions in the prayer room might include financial analysts, carpenters, receptionists, secretaries and ironworkers. There were American natives, immigrants who had earned citizenship, visitors conducting international business — the whole Muslim spectrum of nationality and race.

Leaping down the stairs on Sept. 11, 2001, when he had been installing ceiling speakers for a reinsurance company on the 49th floor, Mr. Abdus-Salaam had a brief, panicked thought. He didn’t see any of the Muslims he recognized from the prayer room. Where were they? Had they managed to evacuate?

He staggered out to the gathering place at Broadway and Vesey. From that corner, he watched the south tower collapse, to be followed soon by the north one. Somewhere in the smoking, burning mountain of rubble lay whatever remained of the prayer room, and also of some of the Muslims who had used it.

Given the vitriolic opposition now to the proposal to build a Muslim community center two blocks from ground zero, one might say something else has been destroyed: the realization that Muslim people and the Muslim religion were part of the life of the World Trade Center.

Opponents of the Park51 project say the presence of a Muslim center dishonors the victims of the Islamic extremists who flew two jets into the towers. Yet not only were Muslims peacefully worshiping in the twin towers long before the attacks, but even after the 1993 bombing of one tower by a Muslim radical, Ramzi Yousef, their religious observance generated no opposition

“We weren’t aliens,” Mr. Abdus-Salaam, 60, said in a telephone interview from Florida, where he moved in retirement. “We had a foothold there. You’d walk into the elevator in the morning and say, ‘Salaam aleikum,’ to one construction worker and five more guys in suits would answer, ‘Aleikum salaam.’ ”

One of those men in suits could have been Zafar Sareshwala, a financial executive for the Parsoli Corporation, who went to the prayer room while on business trips from his London office. He was introduced to it, he recently recalled, by a Manhattan investment banker who happened to be Jewish.

“It was so freeing and so calm,” Mr. Sareshwala, 47, said in a phone conversation from Mumbai, where he is now based. “It had the feel of a real mosque. And the best part is that you are in the epicenter of capitalism — New York City, the World Trade Center — and you had this island of spiritualism. I don’t think you could have that combination anywhere in the world.”