The two horizontal blue stripes on the Israeli flag do not represent rivers (such as the Nile and Euphrates) or any territorial claims to land between them.
The official and historical symbolism of the flag is rooted in Jewish religious tradition:
•  The design is directly inspired by the tallit (תַּלִּית), the traditional Jewish prayer shawl, which is typically white with two blue stripes along the edges.
•  The blue color (historically tekhelet, a specific sky-blue or azure dye from ancient times) symbolizes divinity, heaven, holiness, and the commandments (mitzvot) in Jewish law, as referenced in the Torah (e.g., Numbers 15:38–39, which instructs including a blue thread in the tzitzit fringes of garments).
•  The central Star of David (Magen David) represents Jewish identity, protection, and the rebirth of the Jewish people in their homeland.
This design was used by the Zionist movement as early as the late 19th century (e.g., displayed in Rishon LeZion in 1885 and at the First Zionist Congress in 1897), and it was officially adopted by the State of Israel on October 28, 1948, shortly after independence.
The claim that the stripes represent the Nile and Euphrates (implying a “Greater Israel” stretching across much of the Middle East) is a widespread misconception or propaganda trope, often promoted in some Arab media, by figures like Yasser Arafat (in a 1988 Playboy interview), in the 1988 Hamas Covenant, or in Palestinian Authority statements. It interprets the stripes as symbolic borders from biblical descriptions of the Promised Land (e.g., Genesis 15:18). However, this has been repeatedly debunked as unfounded:
•  No official Israeli sources, Zionist founders (like David Wolffsohn, who proposed the tallit-inspired design), or historical records support it.
•  Fact-checks, historians, and even some Arab writers (e.g., Saqr Abu Fakhr) describe it as a persistent myth in parts of the Arab world, lacking evidence and refuted by the flag’s documented origins.
•  Israel’s territorial history (e.g., returning the Sinai Peninsula in 1982) contradicts any notion of pursuing such vast expansion.
In short, the flag’s stripes are a religious and cultural symbol of Jewish prayer and heritage—not geography or conquest.

You posted a video that incorrectly said their flag was specifically designed to mean one thing when in fact it wasn’t. I was just pointing out the person who said that on the video is just wrong.

That would be like me saying the 13 stripes on the American flag means something else other than what they actually mean.