Now Jesus did many other signs in the presence of the disciples, which are not written in this book; 31 but these are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name. John 20:30-31 (ESV)
Here is a simple way to remember what you can find in each chapter of Matthew's Gospel.
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The WORD of God is truly amazing!