I would like to clarify that Muslims believe that books were revealed by God to His prophets; and among these are the Torah, the Gospels, David’s Psalms, and the Qur’an and accounts of prophet Abraham’s life. Their belief in these reveations is a fundamental aspect of islamic teachings. Therefore, the Muslims believe that, generally speaking, the Torah and the Gospels are divinely revealed. But people who follow these revelations have introduced fabrications in them. God has revealed this fact to us in the Qur’an. Therefore not all of the Bible is fabricated. And not all that Jews and Christians claim to be true of the Bible is wholly from God.
Muslims' attitude is imposed by the teachings of the Prophet (pbuh), who said: “Do not give credence to what the people of the Book (Jews and Christians); and do not refute it outright.” Therefore, when we quote the Bible, we are in fact quoting what finds support in the qur’an, and not arbitrarily.