Jewish NFL star Julian Edelman says the anti-Semitic slur uttered by Meyers Leonard is the result of "casual ignorance" ... and he's offering to educate the NBA player on Jewish history so he doesn't make the same mistake twice.

Edelman says he's never met Leonard before -- but he's clearly caught up on the scandal surrounding the Miami Heat player, who used the anti-Semitic K-word to attack an opponent during a video game live stream this week.