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.
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(New International Version Bible Online)