Leader of the opposition Isaac Herzog said Sa'ed Dewabshe, who died on Saturday was another victim of terror and extremism.
Dewabshe was the second victim of an arson attack on his West Bank home in which his 18-month baby boy was killed. Jewish terrorists are suspected in the attack.
"The fire that burned the Dewabse family is a fire that is foreign and that threatens our existence here," Herzog said.
"A person that burns families, throws stones and firebombs and kills young innocent girls is a terrorist, and it makes no difference what his ethnicity or religion is, or from which rabbi or imam he learned about evil and extremism," he added.