Recent terrorist attacks in Saudi Arabia, Istanbul, Dhaka and Baghdad were denounced by leaders of the Muslim community at a Hari Raya Aidilfitri prayer session today (July 6) at Ar-Raudhah Mosque.
About 4,000 turned up for the prayer session in the early morning today at the mosque at Bukit Batok to commemorate the end of Ramadan.
After the session, Minister-in-charge of Muslim Affairs, Dr Yaacob Ibrahim told reporters that a suicide attack near the Prophet's Mosque in the Saudi city of Medina on Monday, reflected a lack of respect for Muslims and the Muslim tradition.
On Monday, suicide bombers with suspected links to the Islamic State in Iraq and Syria (ISIS) targeted the mosque - one of Islam's most sacred sites- and two other sites in Saudi Arabia.
No one claimed responsibility for the triple suicide bombings, but ISIS had in each of the past three years urged its supporters to carry out attacks during Ramadan.
Dr Yaacob said the attackers " have no sense of sacredness".
He added: "I dare say they are not even believing Muslims as far as I'm concerned.
"I think the Muslim world must stand up to this. It's about time all our religious leaders not only condemn them but really, in the most clear way, send a signal that this is not something we condone."
Dr Mohamed Fatris Bakaram, Mufti of the Republic of Singapore, said that extremist groups like ISIS had "blatantly defiled the sanctity of the month of Ramadan with the attacks in Istanbul, Dhaka and Baghdad".
"Even the holy city of of Madinah and the Prophet's mosque were not spared their violence and cruelty," Dr Fatris noted in his sermon.
He added: "It must be our duty to strongly reject this ideology of violence, and also to reject all teachings that sow the seeds of hatred towards others, whether they share our faith or are from a different faith."
In Singapore, 69 mosques held Hari Raya Aidilfitri prayer sessions to commemorate the end of Ramadan.