Thousands of Lebanese people attended the event in Beirut, al-Ahed news website reported.
The said Salat al-Mayyit (funeral prayers) and pledge allegiance to the martyrs’ cause.
Seyed Ali Ibrahim Zanjani, Mahmoud Adnan Hamid, Issa Ali Barji, Talal Adil Hamza Shams, and Ahmed Fayadh Mustafa were killed in an attack by Turkish military on the positions of the Syrian army in Idlib on Saturday night.
Ankara has been deploying troops in Idlib and has been engaging in direct clashes against Syrian forces in bid to assist terrorist groups halt Damascus' ongoing military operation in the province.
The Syrian army launched the offensive August last year after terrorists failed to honor the Sochi de-escalation zone agreement brokered between Russian and Turkey in September 2018.