Genesis 22:14 & Exodus 6:3 | In Exodus 6:3 God tells Moses that Abraham, Isaac, and Jacob did not kn

In Exodus 6:3 God tells Moses that Abraham, Isaac, and Jacob did not know Him by His name “Jehovah.” Yet in Genesis 22:14 Abraham uses the name “Jehovah,” calling the place “Jehovah-jireh.” And previous to this he had called God “LORD.” So how can this be