Israel says (Devarim 6:4) "Hear, O Israel, the L–rd our G–d, the L–rd is one," and the Holy Spirit cries out and says (Ibid. 33:29) "Happy are you, Israel! Who is like you, etc.?"
Where Israel First Demonstrated What It Means to Praise God with
Mekhilta Tractate Shirah 3:5