Israeli newspaper Makor Rishon (Hebrew only, not online) quotes Nabil Sha'ath, head of the Palestinian Arab negotiating team, as saying:
I would like to thank the people who write in Haaretz, which we read every day; we know that you are with us and that you represent us.
The B'Sheva newspaper (Hebrew) says that he made this quote in Ramallah during a meeting of "The Geneva Initiative" and paraphrased him as saying that they read Haaretz every day and that it faithfully represents their cause.
(h/t Ruchie)