Comentário sobre Deuteronômio 20:5

ולא חנכו [WHAT MAN IS THERE THAT HATH BUILT A NEW HOUSE] AND HATH NOT DEDICATED IT — i.e. has not yet dwelt in it. The term חנך denotes beginning a thing (here, it means beginning to live in it; cf. Rashi on Genesis 14:14).

פן ימות במלחמה ואיש אחר יחנכנו, perhaps the man in question had been guilty of a sin on account of which he would be punished by death or one of the punishments mentioned in the Tochahach, the lengthy warnings of Moses in chapter 28. His death would undermine the morale of his brothers in arms.

מי האיש אשר בנה בית חדש ולא חנכו, “who is the man who has built a new house and has not yet consecrated it?” The expression חנך used here by the Torah for moving into one’s private home is the same as that used by the Torah for the consecration of the Altar in the Tabernacle, i.e. חנכת המזבח.
Rabbi Avraham Ibn Ezra writes: “seeing such a man’s heart and his craving is so dedicated to consecrating his new house he cannot concentrate on the battle as a soldier should. He may therefore become a liability by fleeing, and other comrades may follow his example, the result being demoralization of the army.”
In connection with the new vineyard the Torah speaks of it not having been חללו instead of חנכו. The word חללו is similar to חליל, flute; it was customary to dance to the accompaniment of flutes when the first harvest of a new vineyard was brought in.
Our sages in Pessikta Zutrata, quoted by Rashi, understand the word as חולין, “secular, profane i.e. after the grapes during the fourth year were holy, now in the fifth year they were available, freely, to the owner for the first time. In the previous year they could be eaten only after having been redeemed, etc.