Bon Jovi-Sambora’s on Edge

Bon Jovi guitarist Richie Sambora is feeling a little bit on edge -- after Jon Bon Jovi made a snide comment about the differences between him and U2 guitarist The Edge.

Jon appeared on Ellen and spoke about Sambora's sitting out the band's current tour for personal reasons, saying, “Life goes on, so if someone chooses not to be here…unlike if this were, God forbid, The Edge, and he for some reason couldn’t make a U2 show, [then] it would be very difficult to just step in.”

A source tells Radar Online that Sambora was livid and fired off a three-word E-mail reading, "Hire The Edge."

The insider says, “Richie was so pissed off and insulted with the Edge comment that he couldn’t bite his tongue any longer. He sent Jon an E-mail, but Jon did not respond. Jon hasn’t called Richie once since this all began."