And when it is said to them: ‘Believe in this (Book) which Allah has (now) revealed,’ they say: ‘We believe only in that (Book) which was revealed to us,’ and they deny all other than that, whereas this (Qur’an) is (also) the Truth (and) confirms that (Book as well) which they possess. Ask (them): ‘Then why have you been killing the Prophets of Allah before this if you (really) believe (but in your own Book)?’