Zechariah 3:2 (LSB)
2 And Yahweh said to Satan, "Yahweh rebuke you, Satan! Indeed, Yahweh who has chosen Jerusalem rebuke you! Is this not a brand delivered from the fire?"
"The Lord" (Yahweh) tells "the Lord" (Yahweh) to rebuke Satan. This speaks to the plurality within God.
This is God speaking in the third person. There are many instances of God speaking in the third person in Scripture (Exodus 24:1-2, 33:19, 34:5-7, Leviticus 21:8, Numbers 12:8, 32:11-12: 2 Samuel 7:11, Hosea 1:7, Amos 4:11, Zechariah 2:11), for example:
Exodus 33:19 (LSB)
19 And He said, "I Myself will make all My goodness pass before you, and I will proclaim the name of Yahweh before you; and I will be gracious to whom I will be gracious, and I will show compassion on whom I will show compassion."