I’m not Jewish but I believe that the phrase “May God avenge their blood” is the only appropriate one at the moment.
Very tragic. Islam always seems to kill the good people first - people like this couple, priests saying Mass, nuns teaching - because Islam, unlike Judaism and Christianity, chooses death.
Prayers for these good people, and may life win.
“Rabbi Gavriel, Rivka Holtzberg and the others murdered...I heard another Rabbi was killed....
Hashem Yikom Damo.