According to Haaretz, 15 July 2013, the government of Benjamin Netanyahu has backtracked on the issue regarding the delivery of weapons to the "rebels" in Syria [1].

Concerned about the consequences of a victory at the hands of the Assad government—backed by Hezbollah and Iran—and following the unrest in the Golan Heights, the Israeli government has apparently decided to fill in for Qatar. It has thus approved the delivery of weapons, with the exception of anti-aircraft weapons.

[1] "Israel tones down opposition to Western arming of Syrian rebels", by Anshel Pfeffer, Haaretz, 15 July 2013.