He probably meant that he consulted written sources available to him as he compiled the list of Jesus ’ genealogy that we can read in his Gospel.
ويعني ذلك على الارجح انه تفحص مراجع متوفرة في ايامه وهو يُعدّ سلسلة نسب يسوع التي نجدها في انجيله .‏