Arcana Coelestia # 8612
8612. 'Supported his hands' means support supplied to the power of truth engaged in conflict. This is clear from the meaning of 'hands' as power, dealt with in 878, 4931-4937, 7518, 8050, 8153, at this point the power of truth engaged in conflict, represented by 'Joshua', 8595. The reason why support supplied to truth engaged in conflict is meant by Aaron and Hur's supporting Moses' hands is that when Moses' hands were raised up Joshua prevailed.
Say
As with many common verbs, the meaning of “to say” in the Bible is highly dependent on context. Who is speaking? Who is hearing? What is it about? Is it a command, a message, an apology, instruction? All these things enter into the meaning of “say.” In general, though, “saying” has to do with sharing truth at various levels -- from the most exalted power people can have to perceive the Lord's desires directly to the most basic of orders issued to people at their lowest.