Revelation 2:27 καὶ ποιμανεῖ αὐτοὺς ἐν ῥάβδῳ σιδηρᾷ ὡς τὰ σκεύη τὰ κεραμικὰ συντρίβεται
He will rule them with a rod of iron, shattering them like clay pots; as I also have received of my Father:
Noun: Dative Singular Feminine

Revelation 11:1 Καὶ ἐδόθη μοι κάλαμος ὅμοιος ῥάβδῳ λέγων, ἔγειρε καὶ μέτρησον τὸν ναὸν τοῦ θεοῦ καὶ τὸ θυσιαστήριον καὶ τοὺς προσκυνοῦντας ἐν αὐτῷ.
A reed like a rod was given to me. Someone said, "Rise, and measure God's temple, and the altar, and those who worship in it.
Noun: Dative Singular Feminine

Revelation 12:5 καὶ ἔτεκεν υἱόν ἄρσεν, ὃς μέλλει ποιμαίνειν πάντα τὰ ἔθνη ἐν ῥάβδῳ σιδηρᾷ. καὶ ἡρπάσθη τὸ τέκνον αὐτῆς πρὸς τὸν θεὸν καὶ πρὸς τὸν θρόνον αὐτοῦ.
She gave birth to a son, a male child, who is to rule all the nations with a rod of iron. Her child was caught up to God, and to his throne.
Noun: Dative Singular Feminine

Revelation 19:15 καὶ ἐκ τοῦ στόματος αὐτοῦ ἐκπορεύεται ῥομφαία ὀξεῖα, ἵνα ἐν αὐτῇ πατάξῃ τὰ ἔθνη, καὶ αὐτὸς ποιμανεῖ αὐτοὺς ἐν ῥάβδῳ σιδηρᾷ καὶ αὐτὸς πατεῖ τὴν ληνὸν τοῦ οἴνου τοῦ θυμοῦ τῆς ὀργῆς τοῦ θεοῦ τοῦ παντοκράτορος,
Out of his mouth proceeds a sharp, double-edged sword, that with it he should strike the nations. He will rule them with an iron rod. He treads the winepress of the fierceness of the wrath of God, the Almighty.
Noun: Dative Singular Feminine