At least 104 detainees, including 24 women, have been freed in a prisoner swap with regime forces as a part of evacuation deal reached last July to deport powerful Tahrir al-Sham from a Lebanese border enclave, activists said on Saturday.
The former al-Qaeda affiliate, in return, has freed 4 Hezbollah militants and two corpses.
Two weeks ago, around 9,000 Syrians including jihadists and their families crossed from Lebanon into northern Idlib province as part of a ceasefire deal between Tahrir al-Sham and Hezbollah.
Jabhat al-Nusra, now known as Hayat Tahrir Al-Sham (HTS), and ISIS took over large swathes of the Lebanon-Syria border region in 2014.
Hezbollah, together with the Lebanese army, has waged a military campaign to recapture the territory. In recent weeks, Hezbollah says it has regained control of around 95% of the area, culminating in the ceasefire deal, which was agreed last week.