abideth - implying a condition lasting, without intermission, and without end.
He that saith ... ought - so that his deeds may be consistent with his words.
even as he - Believers readily supply the name, their hearts being full of Him (compare Joh 20:15). “Even as He walked” when on earth, especially in respect to love. John delights in referring to Christ as the model man, with the words, “Even as He,” etc. “It is not Christ’s walking on the sea, but His ordinary walk, that we are called on to imitate” [Luther].