:::::That's kind of speculative. Common sense would dictate that the SNC would certainly condemn Israel's intervention, out of necessity, regardless of whether Isreal acted in their support or not (Arabs and Israelis being on such great terms and all). Even if the rebels were not, in addition, a mostly Islamist faction. What else can they possibly say? 

 :::::In fact, that statement just looks like plain (war) propaganda. Neither the rebels nor the government are in any kind of position to actually retaliate against Israel. Even were it not in a civil war, Syria's ability to "retaliate" against Israel would be highly questionable. As things are, the very idea is laughable, and would constitute military and political suicide. 

 :::::The statement is just a clever propaganda twist, and all it shows is that the rebels are publicly "opposed" to Israel. It has no bearing on the question of whether or not they really are being supported by the Israelis. And since the latter are actually bombing their enemies...