Commentaries:
Robertson's Word Pictures (NT)
Called to be Jesus Christ's (klhtoi Ihsou Xristou). Predicate genitive after klhtoi (verbal adjective from kalew, to call), though it is possible to consider it the ablative case, "called of (or from) Jesus Christ."
Other Robertson's Word Pictures (NT) entries containing Romans 1:6:
Romans 1:7
Romans 16:3
2 Corinthians 7:1
Hebrews 1:1
Jude 1:1
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