The Shema (שמע ישראל), a central declaration of faith in Judaism, is found in this parashah, and begins with the words "Hear, O Israel: The Lord our God, the Lord is one" (6:4).
When someone agrees with another’s statement, they often say: “Hear, hear!”. This phrase comes from "Hear ye, hear ye," historically used in English courtrooms to call attention to proclamations, echoing the imperative to listen and heed important declarations. It is used as a “general form of cheering in the British House of Commons” (Oxford English Dictionary) because applause is forbidden in the House of Commons and House of Lords.
This phrase “Hear, hear!” finds its origin in the King James Bible. If Israel is commanded to listen well to G-d with the phrase “Hear, O Israel”, how suitable it is to use this phrase to tell everyone to heed close attention to what is being said!