Arab countries sticking together according to their faith. The gulf states are blunted, as they are US client states. So hardly a threat to Israel.
Since when do you see two Sunni Muslim states attacking each other? The only time its happened in recent memory is Iraq's invasion of Kuwait. And when Saudi Arabia, Egypt and Morocco joined the coalition in Desert Storm. Saddam attacked Israel with SCUDs knowing that an Israeli retaliation would result in Muslim majority countries leaving the coalition. Hence Israel did not respond.