Joshua 3:5

Sanctify yourselves - What was implied in this command we are not informed; but it is likely that it was the same as that given by Moses, Exo 19:10-14. They were to wash themselves and their garments, and abstain from every thing that might indispose their minds from a profitable attention to the miracle about to be wrought in their behalf.

Joshua said unto the people--rather "had said," for as he speaks of "to-morrow," the address must have been made previous to the day of crossing, and the sanctification was in all probability the same as Moses had commanded before the giving of the law, consisting of an outward cleansing (Exo 19:10-15) preparatory to that serious and devout state of mind with which so great a manifestation should be witnessed.

And Joshua said unto the people,.... On the third day; and the thirtieth day of the mourning for Moses, Jarchi says, was the first of the three days, and that being the seventh day of the month, this must be the ninth, as it is most clear the morrow was the tenth: sanctify yourselves; in a ceremonial sense, by washing their bodies and their clothes, and abstaining from their wives; and in a moral sense, by acts of religion and devotion, by prayer and meditation, and the exercise of repentance and, good works: it may denote that sanctification is necessary to our passage over Jordan, or through death to the heavenly Canaan, for without holiness no man shall see the Lord: for tomorrow the Lord will do wonders among you: in their sight and presence, and for them, by dividing the waters of Jordan, that they might pass through it as on dry land; this, as Kimchi says, was the tenth of Nisan, as is plain from Jos 4:19.

Passage Through the Jordan - Joshua 3-4 The following morning, after the return of the spies into the camp, Joshua proceeded with the people from Shittim to the bank of the Jordan, to complete the necessary preparations there, and then cross the river and enter Canaan (Jos 3:1). The crossing of this boundary river of Canaan, or rather the passage through the bed of the river, which had been dried up by a miracle of divine omnipotence at the place of crossing, is narrated in these two chapters in the following manner: first (Jos 3:1-6), the final preparations for crossing; and then the passage through the bed of the river and the erection of stones as a permanent memorial of this miracle. This is arranged in three parts: viz., Jos 3:7-17, the commencement of the crossing; Jos 4:1-14, its further progress; and Jos 4:15-24, its close. The account is also arranged upon the following plan: in every one of these three sections the command of God to Joshua is mentioned first (cf. Jos 3:7-8; Jos 4:2-3, Jos 4:15-16); then the communication of this command to the people by Joshua; and finally its execution (Jos 3:9-17; Jos 4:4-13, Jos 4:17-20). This arrangement was adopted by the author for the purpose of bringing distinctly out to view, not only the miracle itself, but also the means with which God associated the performance of the miracle, and also of impressing deeply upon the memory of the people both the divine act and the end secured. In doing this, however, some repetitions were inevitable, in consequence of the endeavour, so peculiar to the Hebrew mode of writing history to mark and round off the several points in the occurrences described, by such comprehensive statements as anticipate the actual course of events. It is to this arrangement and dovetailing of the differin…

This chapter, and that which follows it, give us the history of Israel's passing through Jordan into Canaan, and a very memorable history it is. Long afterwards, they are told to remember what God did for them between Shittim (whence they decamped, Jos 3:1). and Gilgal, where they next pitched, Jos 4:19, Mic 6:5, that they might know the righteousness of the Lord. By Joshua's order they marched up to the river's side (Jos 3:1), and then almighty power led them through it. They passed through the Red Sea unexpectedly, and in their flight by night, but they have notice some time before of their passing through Jordan, and their expectations raised. I. The people are directed to follow the ark (Jos 3:2-4). II. They are commanded to sanctify themselves (Jos 3:5). III. The priests with the ark are ordered to lead the van (Jos 3:6). IV. Joshua is magnified and made commander in chief (v. 7, 8). V. Public notice is given of what God is about to do for them (v. 9-13). IV. The thing is done, Jordan is divided, and Israel brought safely through it (v. 14-17). This was the Lord's doing, and it is marvellous in our eyes.

3:5 Purify yourselves: They had to separate themselves from anything unclean that would bar an Israelite from coming into God’s presence (cp. Exod 19:9-20; Lev 11:44).