John wrote three letters that address false teaching concerning the person of the Messiah and concerning the basis of righteousness.
1 John 1-2, We Have Touched With Our hands
John is writing to address heretical confusion sown among believers as to the nature and person of the Messiah. He starts by stating that he has personally seen, heard and touched Y'shua.
1 John 2, No New Commandment
John speaks of the Torah as both an old commandment and a new commandment. In this view, the text has not changed but our understanding of it must be adjusted in light of the sacrifice of Y'shua. His light shines upon us and allows us to understand the spirit of the Torah as well as the letter.