Joshua 3:5
“And Joshua said unto the people, Sanctify yourselves: for to morrow the Lord will do wonders among you.”
And they commanded the people, saying, When ye see the ark of the covenant of the Lord your God, and the priests the Levites bearing it, then ye shall remove from your place, and go after it.
Yet there shall be a space between you and it, about two thousand cubits by measure: come not near unto it, that ye may know the way by which ye must go: for ye have not passed this way heretofore.
And Joshua said unto the people, Sanctify yourselves: for to morrow the Lord will do wonders among you.
And Joshua spake unto the priests, saying, Take up the ark of the covenant, and pass over before the people. And they took up the ark of the covenant, and went before the people.
And the Lord said unto Joshua, This day will I begin to magnify thee in the sight of all Israel, that they may know that, as I was with Moses, so I will be with thee.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Then Elisha said, Hear ye the word of the Lord; Thus saith the Lord, To morrow about this time shall a measure of fine flour be sold for a shekel, and two measures of barley for a shekel, in the gate of Samaria.”
“Sanctify yourselves therefore, and be ye holy: for I am the Lord your God.”
“Up, sanctify the people, and say, Sanctify yourselves against to morrow: for thus saith the Lord God of Israel, There is an accursed thing in the midst of thee, O Israel: thou canst not stand before thine enemies, until ye take away the accursed thing from among you.”
“Gather the people, sanctify the congregation, assemble the elders, gather the children, and those that suck the breasts: let the bridegroom go forth of his chamber, and the bride out of her closet.”
“And he said, Peaceably: I am come to sacrifice unto the Lord: sanctify yourselves, and come with me to the sacrifice. And he sanctified Jesse and his sons, and called them to the sacrifice.”