Verses 5 and 6 of the chapter belong to the section which deals with the preparation. General instructions had been already issued that the host was to follow the ark, leaving two thousand cubits between them and it; but nothing had been said as to how Jordan was to be crossed. No doubt many a question and doubt had been muttered by the watch-fires, as the people looked at the muddy, turbid stream, swirling in flood. The spies probably managed to swim it, but that was a feat worthy to be named in the epitaph of heroes (1 Chron. xii. 15), and impossible for the crowd of all ages and both sexes which followed Joshua. There was the rushing stream, swollen as it always is in harvest. How were they to get over? And if the people of Jericho, right over against them, chose to fall upon them as they were struggling across, what could hinder utter defeat? No doubt, all that was canvassed, in all sorts of tones; but no inkling of the miracle seems to have been given.
God often opens His hand by one finger at a time, and leaves us face to face with some plain but difficult duty, without letting us see the helps to its performance, till we need to use them. If we go right on the road which He has traced out, it will never lead us into a blind alley. The mountains will part before us as we come near what looked their impassable wall; and some narrow gorge or other, wide enough to run a track through, but not wide enough to be noticed before we are close on it, will be sure to open. The attitude of expectation of God's help, while its nature is unrevealed, is kept up in Joshua's last instruction. The people are bidden to 'sanctify themselves, because to-morrow the Lord will do wonders' among them. That sanctifying was not external, but included the hallowing of spirit by docile waiting for His intervention, and by obedience while the manner of it was hidden. The secret of to-morrow is partly made known, and the faith of the people is nourished by the mystery remaining, as well as by the light given. The best security for to-morrow's wonders is to-day's sanctifying.
The command to the priests discloses to them a little more, in bidding them pass over before the people, but the additional disclosure would only be an additional trial of faith; for the silence as to how so impossible a command was to be made possible is absolute. The swollen river had obliterated all fords; and how were priests, staggering under the weight of the ark on their shoulders, to 'pass over'? The question is not answered till the ark is on their shoulders. To-day often sees to-morrow's duty without seeing how it is to be done. But the bearers of the ark need never fear but that the God to whom it belongs will take care of it and of them. The last sentence of verse 6 is the anticipatory summary which closes each section.
In verses 7-17 we have the narrative of the actual crossing, in its three divisions of God's command (vs. 7-8), Joshua's repetition of it (vs. 9-13), and the historical fact (vs. 14-17). The final instructions were only given on the morning of the day of crossing. The report of God's commands given in verses 7 and 8 is condensed, as is evident from the fuller statement of them in Joshua's address to the people, which immediately follows. In it Joshua is fully aware of the manner of the miracle and of the details of the crossing, but we have no record of his having received them. The summary of that eventful morning's instructions to him emphasises first the bearing of the miracle on his reputation. The passage of the Red Sea had authenticated the mission of Moses to the past generation, who, in consequence of it, 'believed God and His servant Moses.' The new generation are to have a parallel authentication of Joshua's commission. It is noteworthy that this is not the purpose of the miracle which the leader announces to the people in verse 10. It was a message from God to himself, a kind of gracious whisper meant for his own encouragement. What a thought to fill a man's heart with humble devotion, that God would work such a wonder in order to demonstrate that He was with him! And what a glimpse of more to follow lay in that promise, 'This day will I _begin_ to magnify thee I'