Naaseh V’Nishmah With Echad

We recite in the piyyut: “U’bau kulam b’bris Yachad naaseh v’nishmah amru k’echad.” (And they all came with one bond. They said Naaseh V’Nishmah as one.) Rav Hirsh of Rimanov zy”a explains this to be referring to the word “echad” in Kriyas Shema. The piyyut is saying that Klal Yisroel said Naaseh V’Nishmah with fiery enthusiasm, just like we say “Shema Yisroel Hashem Elokeinu Hashem Echad” with the same amount of excitement.