13 As you know, it was because of an illness that I first preached the gospel to you,

Read Galatians 4:13 Using Other Translations

Ye know how through infirmity of the flesh I preached the gospel unto you at the first.
You know it was because of a bodily ailment that I preached the gospel to you at first,
Surely you remember that I was sick when I first brought you the Good News.