Commentaries:
Robertson's Word Pictures (NT)
As for you (umeiv). Emphatic proleptic position before the relative o and subject of hkousate, a familiar idiom in John 8:45; John 10:29, etc. Here for emphatic contrast with the antichrists. See I John 1:1 for ap arxhv (from the beginning).
Let abide in you (en umin menetw). Present active imperative of menw, to remain. Do not be carried away by the new-fangled Gnostic teaching.
Other Robertson's Word Pictures (NT) entries containing 1 John 2:24:
John 6:64
1 John 2:27
1 John 4:3
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