And because of their saying ( in boast ) , " We killed Messiah ' Iesa ( Jesus ) , son of Maryam ( Mary ) , the Messenger of Allah , " - but they killed him not , nor crucified him , but the resemblance of ' Iesa ( Jesus ) was put over another man ( and they killed that man ) , and those who differ therein are full of doubts . They have no ( certain ) knowledge , they follow nothing but conjecture .