Lawyers for chemistry teacher Jamshed Javeed, 30, told the court in London that he "never supported and does not support the aims of ISIS (Islamic State) as now revealed and understood".
They said that Javeed last year sent money to his brother to help him and a friend travel to Syria to fight against President Bashar al-Assad's regime because he had been "deeply moved" by the suffering of the civilian population.
The married father of two, who taught at a high school in Bolton near Manchester in northwest England, had also planned to travel to Syria in November 2013 but was unable to do so after his family hid his passport, the lawyers said.
Tony Mole, head of the police's North West Counter Terrorism Unit, said: "The evidence indicates he has got together with a group who had been very determined to go out to Syria and fight.
Javeed is due to be sentenced on December 12.