(20) if ye will go armed before the Lord . . . --The same verb and the same preposition are here used which are used in Numbers 32:17. It may be inferred from this expression that the army of the Israelites was regarded as the army of the Lord; and it seems probable that there is a reference to the ark of the Lord as being carried on certain occasions into the war. If the order of march prescribed in the second chapter of this Book was still observed, there may be a reference to the fact that the tribes of Reuben and Gad, which encamped on the south side of the Tabernacle, immediately preceded the ark (see Numbers 10:18-22), just as those of Ephraim, Benjamin, and Manasseh immediately followed it (Psalm 80:2). At the time of the passage of the Jordan, the priests who bare the ark stood still in the river until the whole of the people had passed over "before the ark of the Lord" (Joshua 4:5; Joshua 4:11); but at the siege of Jericho it appears that the ark was carried in the midst of the host, some of the armed men going before it, and some following after it (Joshua 6:9). If this is the true meaning of the word "before the Lord," it was natural that the Reubenites, or their spokesman, should first use the words "before the children of Israel" in Numbers 32:17, and should not adopt the expression "before the Lord," as in Numbers 32:32, until it had been previously employed by Moses.

Verse 20. - Before the Lord. Perhaps in a quasi-local sense, as the vanguard of the host before the sacred symbols of the Lord's presence (see on chapter Numbers 10:21, and Joshua 6:9). But since the same expression (לִפְנֵי יְהוָה) is twice used in a much vaguer sense in verse 22, it is more probable that it only means "in the Lord's service, or "beneath his eye."

32:16-27 Here is the good effect of plain dealing. Moses, by showing their sin, and the danger of it, brought them to their duty, without murmuring or disputing. All men ought to consider the interests of others as well as their own; the law of love requires us to labour, venture, or suffer for each other as there may be occasion. They propose that their men of war should go ready armed before the children of Israel into the land of Canaan, and that they should not return till the conquest of Canaan was ended. Moses grants their request, but he warns them of the danger of breaking their word. If you fail, you sin against the Lord, and not against your brethren only; God will certainly reckon with you for it. Be sure your sin will find you out. Sin will surely find out the sinner sooner or later. It concerns us now to find our sins out, that we may repent of them, and forsake them, lest they find us out to our ruin.And Moses said unto them,.... Being better disposed towards them, and more satisfied with the reasonableness of their request, it being explained unto him:

if ye will do this thing; which they had promised:

if ye will go armed before the Lord to war; they had said they would go ready armed before the children of Israel, but Moses expresses it "before the Lord"; which is more agreeable to their encampment and order in marching, for not the standard of Reuben but that of Judah went foremost, yet the standard of Reuben marched directly before the sanctuary bore by the Kohathites, Numbers 10:18, and so might be properly said to go before the Lord, who dwelt there.