Commentaries:
Robertson's Word Pictures (NT)
Believeth on (pisteuwn eiv). John draws a distinction between "not believing God" (mh pisteuwn tw qew) in next clause, the testimony of God about his Son, and surrender to and reliance on the Son as here (eiv and the accusative). See the same distinction less clearly drawn in John 6:30 f. See also eiv thn marturian after pepisteuken in this same verse and John 2:23.
In him (en autw). "In himself," though the evidence is not decisive between autw and autw.
Hath made (pepoihken). Perfect active indicative of poiew like memarturhken and pepisteuken, permanent state.
A liar (yeusthn). As in I John 1:10, which see.
Because he hath not believed (oti ou pepisteuken). Actual negative reason with negative ou, not the subjective reason as in John 3:18, where we have oti mh pepisteuken). The subjective negative is regular with o mh pisteuwn. Relative clause here repeats close of verse I John 5:9.
Other Robertson's Word Pictures (NT) entries containing 1 John 5:10:
John 3:18
John 5:37
John 8:55
Romans 8:16
1 John 3:23
1 John 5:9
1 John 5:13
1 John 5:13
Revelation 1:2
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