Matthew Poole and continuators on Deuteronomy 20:5

5 And the officers shall speak unto the people, saying, What man is there that hath built a new house, and hath not dedicated it ? let him go and return to his house , lest he die in the battel, and another man dedicate it .

Which was done by feasting and thanksgiving to God. See the title of Psal. 30. and Nehem. 12. 27. Heb. hath initiated it, i. e. entred upon it, taken possession of it, dwelt in it.

Least his heart be set upon it, and thereby he be negligent or timerous in the battel to the scandal and prejudice of others.

And so he should lose and another get the fruit of his labours, which might seem unjust or hard. And God provides even for mens infirmities. But this and the following exceptions are to be understood onely of a War allowed by God, not in a War commanded by God, not in the approaching war with the Canaanites, from which even the Bridegroom was not exempted, as the Iewish writers note.