A.T. Robertson Commentary Acts 11:7

"And I heard also a voice saying unto me, Rise, Peter; kill and eat." — Acts 11:7 (ASV)

A voice saying (φωνης λεγουσης). Genitive case after ηκουσα (cf. 9:7 and accusative 9:4 which see for discussion). Participle λεγουσης (present active of λεγω) agreeing with φωνης, a kind of indirect discourse use of the participle.