According to a military source in Damascus, the Syrian Government provided a number of buses to transport the approved Islamist rebels from Al-Zabadani to the Idlib Governorate; this begins the first phase of the ceasefire agreement, along with the release of 500 militants from the custody of the Syrian Arab Army (SAA).
http://www.almasdarnews.com/article/islamist-rebels-begin-withdrawal-from-al-zabadani-first-transport-buses-arrive