It has been suggested that Paul mentioned to Christians in Colossae the role of Luke as a physician because they knew him.
(‏ غل ٤ :‏ ١٣‏ )‏ فَكَمَا قَالَ يَسُوعُ :‏ « لَا يَحْتَاجُ ٱلْأَصِحَّاءُ إِلَى طَبِيبٍ ،‏ بَلِ ٱلسُّقَمَاءُ » .‏ —‏ لو ٥ :‏ ٣١‏ .‏