The Ablative with prepositions is very common in the N.T. in every occurrence the idea of separation is prevalent. The comparative idea is involved in the use with ὑπέρ, πρό and πρός, which implies separation. The ablative with prepositions usually expresses the agent as the source of the action, cf. with ὑπό. ἀπό, ἐκ and πρό always take the Ablative, expressing separation. This is true in compound verbs also.