Deuteronomy 3:18

At that time I gave you orders, saying, The Lord has given you this land for your heritage: all the men of war are to go over armed before your brothers the children of Israel.

Joshua 4:12-13

And the children of Reuben and the children of Gad and the half-tribe of Manasseh went over armed before the children of Israel as Moses had said to them:

Numbers 32:20-24

Then Moses said to them, If you will do this, arming yourselves to go before the Lord to the war,

Joshua 1:12-15

And to the Reubenites and the Gadites and the half-tribe of Manasseh, Joshua said,

Joshua 22:1-9

Then Joshua sent for the Reubenites and the Gadites and the half-tribe of Manasseh,

Treasury of Scripture Knowledge

Summary

And I commanded you at that time, saying, The LORD your God hath given you this land to possess it: ye shall pass over armed before your brethren the children of Israel, all that are meet for the war.

General references

Bible References

I commanded

Numbers 32:20
Then Moses said to them, If you will do this, arming yourselves to go before the Lord to the war,
Joshua 1:12
And to the Reubenites and the Gadites and the half-tribe of Manasseh, Joshua said,
Joshua 4:12
And the children of Reuben and the children of Gad and the half-tribe of Manasseh went over armed before the children of Israel as Moses had said to them:
Joshua 22:1
Then Joshua sent for the Reubenites and the Gadites and the half-tribe of Manasseh,

General references

Numbers 32:17
But we ourselves will be ready armed to go before the children of Israel till we have taken them to their place: but our little ones will be safe in the walled towns against the people of the land.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain