24 As for you, see that what you have heard from the beginning remains in you. If it does, you also will remain in the Son and in the Father.

Read 1 John 2:24 Using Other Translations

Let that therefore abide in you, which ye have heard from the beginning. If that which ye have heard from the beginning shall remain in you, ye also shall continue in the Son, and in the Father.
Let what you heard from the beginning abide in you. If what you heard from the beginning abides in you, then you too will abide in the Son and in the Father.
So you must remain faithful to what you have been taught from the beginning. If you do, you will remain in fellowship with the Son and with the Father.

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