The equality of all citizens of Israel is firmly entrenched in law.
So why doesn't it then?
Treat all citizens equally? It does.
Clearly it doesn't! Just two examples...
Opinion | Not All Israeli Citizens Are Equal
Knesset disqualifies bill seeking equal status for Jews and Arabs
The first is a discussion of the differences in treatment of an Israeli citizen and a foreign national. Irrelevant to the topic.
The second is a bill seeking to undermine the protection of the Jewish character of the State. That is not "equality". That is erasure.
Edited to add: though I would love to see the text of that Bill
1950 law about confiscation of Absentee Landlord Property. This law defines persons who were expelled, fled, or who left the country after November 29, 1947 as “absentee.” Property belonging to “absentees” was placed under the control of the State of Israel with the Custodian for Absentees’ Property. The Absentee Property Law was the main legal instrument used by Israel to take possession of the land belonging to the internal and external Palestinian refugees, and Muslim Waqf properties across the state. This law continues to be used to this day by quasi-governmental agencies in Israel to take over Palestinian properties in East Jerusalem, for example.
1950 Law of Return. This allows every Jewish person to immigrate to Israel and this extends to the children and grandchildren of Jews, as well as their spouses, and the spouses of their children and grandchildren. The flip side of this is that the rights of Palestinians and others to enter the state and become citizens, even if they were born in the area that is now the State of Israel, are extremely restrictive. This discrimination against the non-Jewish minority has been periodically reinforced. For example, the ban on family unification law of 2003 prohibits citizens of Israel from reuniting with Palestinian spouses living in the West Bank or Gaza.
In 1952 the state authorized the World Zionist Organization, the Jewish Agency, and other Zionist bodies founded at the turn of the 20th century to function in Israel as quasi-governmental entities in order to further advance the goals of the Zionist movement, to the detriment of minorities.
The Land Acquisition Law of 1953 transferred the land of 349 Arab towns and villages—approximately 1.2 million dunams in all (~468 square miles)—to the state to be used preferentially for the Jewish majority.
In 1953, the Knesset bestowed governmental authorities on the Jewish National Fund (JNF or Keren Kayemeth LeIsrael) to purchase land for exclusively Jewish use. The state granted financial advantages, including tax relief to facilitate such purchases.
In 1960, the state passed a law which stipulates that the ownership of “Israel lands”—namely the 93% of land under the control of the state, the Jewish National Fund, and the Development Authority—cannot be transferred in any manner.
In 1969, the state passed a law that gave statutory recognition to cultural and educational institutions, and defined their aims, inter alia, as developing and fulfilling Zionist goals to promote Jewish culture and education at the expense of minority goals.
There is a law mandating that Knesset session must be opened with a reading of portions of Israel’s declaration of independence that emphasizes the exclusive connection of the state of Israel to the Jewish people.
There is a law that bans any political party that denies the existence of Israel as a “Jewish” state. In other words, a party that would advocate equal rights for all citizens of Israel irrespective of ethnicity would not be allowed to enter the Knesset.
There are laws that establish separate educational systems which are then unequally administered.
In 2011 the Knesset passed a law that empowers hundreds of local Jewish communities to exclude applicants based on ethnicity or religion. The Supreme Court upheld this law in September 2014.
In 2011 the Knesset passed a law prohibiting anyone from calling for a boycott of Israel, its institutions, or any person because of their affiliation with Israel, including the settlements in the occupied territories. The law creates a private right of action for persons targeted by a boycott to sue for damages. As Noam Sheizaf puts it: “You can boycott anything in Israel except the occupation.” This vague law is blatantly aimed at Palestinians who are supportive of the BDS movement—while it allows people like Avigdor Lieberman to call for boycott of Arab owned businesses with impunity. The law was upheld by Israel’s Supreme Court on April 15, 2015.