ESV Reformation Study Bible – Ex 17:9
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Ex 17:9

17:9 Joshua. Joshua, an Ephraimite previously known as Hoshea (“salvation”), was called Joshua (“Yahweh saves”) at Kadesh, possibly as a result of this victory (Num. 13:8, 16).

I will stand . . . with the staff. Joshua will choose men to fight, but they will do so under the uplifted staff, the sign of the Lord’s victory.