Many scholars believe that where you see Luke writing in the first person - using the words "we" and "us" rather than "them" and "they" - it indicates that Luke was actually present during the events he describes.
Lebaka la go bo ditemana dingwe di dirisa maemedi "re" le "rona" le supa gore Luke o ne a le teng fa ditiragalo dingwe tse di tlhalositsweng di direga.