LXX Num 20:8

Λάβε τὴν ῥάβδον, καὶ ἐκκλησίασον τῇ συναγωγῇ σὺ καὶ Ἀαρὼν ὁ ἀδελφός σου, καὶ λαλήσατε πρὸς τὴν πέτραν ἔναντι αὐτῶν, καὶ δώσει τὰ ὕδατα αὐτῆς· καὶ ἐξοίσετε αὐτοῖς ὕδωρ ἐκ τῆς πέτρας, καὶ ποτιεῖτε τὴν συναγωγὴν καὶ τὰ κτήνη αὐτῶν.

“Take the staff and assemble the congregation. You and your brother Aaron are to speak to the rock while they watch, and it will pour out its water. You will bring out water from the rock and provide drink for the congregation and their livestock.”