Muslims should support Israel and the Jewish right to that land because it was ordained to them by none other than Allah in the Quran:
Please read and dispell your hatred for the jewish people.
Allah in the Quran , is quoting Moses :
005.020
Remember Moses said to his people: "O my people! Call in remembrance the favour of Allah unto you, when He produced prophets among you, made you kings, and gave you what He had not given to any other among the peoples.
005.021
“O my people! Enter the holy land which Allah hath assigned unto you, and turn not back ignominiously, for then will ye be overthrown, to your own ruin.”
and the Tafsirs read :
Tafsir al-Jalalayn:
O my people, enter the Holy, the purified, Land which God has ordained for you, [which] He commanded you to enter, and this is Syria (al-shām), and do not turn back in flight, [do not] retreat in fear of the enemy, or you will end up as losers’, in your efforts.
Tafsir al-Miqbas:
(O my people! Go into the holy land) the purified Damascus, Palestine and parts of Jordan (which Allah hath ordained for you) which Allah has gifted to you and made it a bequest of your father Abraham. (Turn not in flight) retreating, (for surely ye turn back as losers) who are punished: Allah will take away from you the quails and honey:
Tafsir Ibn Kathir:
(21. "O my people! Enter the Holy Land which Allah has assigned to you and turn not back; for then you will be returned as losers.‘’)
Tafsir Ibn Kathir:
The People of Fir`awn drown in the Sea; the Children of Israel inherit the Holy Land
Allah said that He has granted the people who were considered weak, the Children of Israel, to inherit the eastern and western parts of the land. Al-Hasan Al-Basri and Qatadah commented that Allah’s statement,
مَشَـرِقَ الاٌّرْضِ وَمَغَـرِبَهَا الَّتِى بَارَكْنَا فِيهَا]
(…the eastern parts of the land and the western parts thereof which We have blessed.) refers to the Sham area (Greater Syria).
Surat al- A’raf :
007.137
And We made a people, considered weak (and of no account), inheritors of lands in both east and west, - lands whereon We sent down Our blessings. The fair promise of thy Lord was fulfilled for the Children of Israel, because they had patience and constancy, and We levelled to the ground the great works and fine buildings which Pharaoh and his people erected (with such pride).
007.138
We took the Children of Israel (with safety) across the sea. They came upon a people devoted entirely to some idols they had. They said: “O Moses! fashion for us a god like unto the gods they have.” He said: "Surely ye are a people without knowledge.
Tafsir al-Jalalyn
(And We caused the folk who were despised) who were humiliated (to inherit the eastern parts of the land) the land of Jerusalem, Palestine, Jordan and Egypt (and the western parts thereof which We had blessed) part of it with water and trees…
Some piece of advice for muslims :
Volume 4, Book 54, Number 418:
Narrated Salim’s father:
The Prophet said, “Any person who takes a piece of land unjustly will sink down the seven earths on the Day of Resurrection.”