ἔλεγεν (he/she/it was speaking) περὶ τοῦ ναοῦ (temple) τοῦ σώματος αὐτοῦ.

ἔλεγεν (he/she/it was speaking)

περὶ τοῦ ναοῦ (temple)

τοῦ σώματος αὐτοῦ.

He was speaking concerning the temple which is his body.