Well, I study law, and even though constitutional debate was never my department (I almost fell asleep in that course, seriously), let me just say this, hopefully it will become clear.
The Knesset is the authorized system to bring out bills and laws, nowdays.
*Before* 1948, the 'authority', for the lack of a better word, to do so (Even with the British occupation) was "the people's council".
Once the independence war was over, it was decided that "The people's council" will become the Knesset of the people ('Knesset' in Hebrew means "Gathering of men")
Later on it was decided that the laws and bills will be broguht by the Knesset (leter to be called that way), and any authority will be passed from one Knesset to the following one after that.
It was decided not long after that the Knesset shall adopt the 22th Article of "The King's Order-in-Council". It was a clause written by the British people stating that "The law that was (Turkish) is the law that stays". it then turned out to be the 11th Article lf "The basic's law" draft.
It took some decades for the understandment to take that the British law, at more than a few cases, cannot completely go hand in hand with the Hebrew law and the Jewish spirit, so at some point, this thinking has faded.
However, that was not enough to have laws by the Knesset, and people start talking about constitution, as well.
A thinking developed, stating that the Knesset has the authority to both set laws, "normal laws", and to set laws with special "immunity" which will creat a future constitution.
However, it was not possible to create those laws, because the differences between different groups in Israel was so high. A judge called Harari brough up the decition, which was accepted by all, saying that the Knesset will decide on a constitution however and whenever it wills.
In other words, Harari said "There will be no consistution, but we don't say it directly and we give the option for each and every person to see this decision however they want".
It is still known today that the Harari decision is all smoke and mirrors, but shh, ya didn't hear it from me.
Anyway, constitution is a no-no, but it was needed to have laws that are strong enough to make a constitution, and even though we didn't agree on anything, it was agreed, finally, on 11 laws, in Israel known as "The Basic Laws", that are what is called "Israeli constitution" but they are not really.
9 of them talk about the state's wings and institutions ("The government Basic Law", "The Knesset Basic Law", "The Military Basic Law" etc) and only 2 of them speak about human rights-
"The basic law of Human Dignity and Liberty" and "Freedom of Occupation (Labor)"
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Hope it helps understanding.
(Can't believe I rememebered that shit)