How We Know The Gospels were Written Prior to 70 AD

Christian Perspective
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Cold-Case Christianity with J. Warner Wallace: J. Warner Wallace was interviewed by Stelman Smith of the Unapologetic Apologists and addressed the reliability of the New Testament canon of scripture. Were the gospels written late in history? Were they written early enough to have been written by people who actually witnessed the events? How can we be sure about the dating of the gospels?