Romans 11:1 Λέγω οὖν μὴ ἀπώσατο ὁ θεὸς τὸν λαὸν αὐτοῦ μὴ γένοιτο· καὶ γὰρ ἐγὼ Ἰσραηλίτης εἰμί, ἐκ σπέρματος Ἀβραάμ, φυλῆς Βενιαμίν.
I ask then, did God reject his people? May it never be! For I also am an Israelite, a descendant of Abraham, of the tribe of Benjamin.
Noun: Genitive Singular Masculine

Philippians 3:5 περιτομῇ ὀκταήμερος ἐκ γένους Ἰσραήλ, φυλῆς Βενιαμίν, Ἑβραῖος ἐξ Ἑβραίων, κατὰ νόμον Φαρισαῖος,
circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; concerning the law, a Pharisee;
Noun: Genitive Singular Masculine

Revelation 7:8 ἐκ φυλῆς Ζαβουλὼν δώδεκα χιλιάδες, ἐκ φυλῆς Ἰωσὴφ δώδεκα χιλιάδες, ἐκ φυλῆς Βενιαμὶν δώδεκα χιλιάδες ἐσφραγισμένοι.
of the tribe of Zebulun twelve thousand, of the tribe of Joseph twelve thousand, of the tribe of Benjamin were sealed twelve thousand.
Noun: Genitive Singular Masculine