Es muy buena pregunta la que hace el Sr. Ubiaga, los arabes reconocen a Israel...
Basta con que una persona entre a Israel para que al momento de estamparle el pasaporte, ya quede marcado y puedan negarle la entrada a algunos Paises Arabes.
Due to the ongoing Israeli-Palestinian dispute, Afghanistan, Algeria, Iran, Iraq, Kuwait, Lebanon, Libya, Saudi Arabia, Somalia, Sudan, Syria, and Yemen block passports containing stamps or visas from Israel. You may also have difficulties getting into and/or be refused visas to other Islamic countries, such as Bangladesh, Brunei, Indonesia, Malaysia, Pakistan, etc. If you intend to visit any of these nations, ask immigration to stamp a blank page, rather than your passport, when entering. Note that those countries will also search for Jordanian/Egyptian exit stamps from land borders with Israel and will likewise prohibit your entry if they find one.
Please keep this piece of paper safe and secure. In particular, you should not hand it to the border police employee standing right after the passport control. (He or she might absentmindedly think it a confirmation slip and tear it up.) If this paper is lost or damaged, you will have no verification about having entered Israel legally, which will cause you difficulties when leaving.