There is absolutely no problem with the idea that Matthew and/or Luke copied some text from Mark’s Gospel and used it in their Gospels. Perhaps Luke had access to Mark and Matthew and used texts from both of them in his own Gospel. Luke 1:1–4 tells us, “Many have undertaken to draw up an account of the things that have been fulfilled among us, just as they were handed down to us by those who from the first were eyewitnesses and servants of the word. Therefore, since I myself have carefully investigated everything from the beginning, it seemed good also to me to write an orderly account for you, most excellent Theophilus, so that you may know the certainty of the things you have been taught.”
Labda Luka aliweza kupata uandishi wa Marko na Mathayo na kutumia maandiko kutoka zote mbili katika Injili yake mwenyewe. Luka 1:1-4 inatuambia, "Kwa kuwa watu wengi wametia mikono kutunga kwa taratibu habari za mamboyale yaliyotimizwa katikati yatu, kama walivyotuhadithia wale waliokuwa mashahidi wenye kuyaona, na watumishi wa lile neon tokea mwanzo, kukuandkikia kwa taratibu, Theofilo mtukufu, upate kujua hakika ya mambo yale uliyofundishwa."