פּירוש אויף דברים 21:2

ויצאו זקניך THEN THE ELDERS [AND THE JUDGES] SHALL GO FORTH — i.e. the distinguished amongst thy elders, these are the Great Sanhedrin (Sotah 44b).

ומדדו, ”they (the authorities) will measure;” even if it clear how far he is removed from the nearest habitation, the act of performing the measuring will draw the attention of the public to what has happened in their vicinity; the people of the neighbouring towns or villages will institute searches for any resident not accounted for so that the identity of the slain person may be established. If someone in the neighbouring towns has not been accounted for, the family members will come to inspect the carcass to determine if he was related to them. Through these searches it may be determined who might have kept company with the slain man, and if there was a woman in the vicinity whose husband had disappeared and who was therefore an agunah, an abandoned woman unable to remarry until proof would forthcoming that her husband had died, and who could be able to remarry once the identity of the slain main was determined as having been her husband.

ומדדו אך הערים, “and they shall measure unto the cities;” Rabbi B’chor Shor said that G–d commanded all these details in order to publicise the fact that an unidentified person had been found murdered so that witnesses who might be able to identify the slain man and to thus prevent his widow from becoming an agunah, a woman who is unable to remarry due to our not knowing if her husband had really died. When our sages in the Talmud tractate Yevamot folio 120, stated that the only valid identification is recognising the carcasses’ face, including his nose, this is meant when the identification is only based on facial features including the nose. When we can hear from the way the witnesses speak about the deceased that he must have been familiar to them, this testimony is definitely sufficient to allow the deceased’s widow to remarry, even if this identification occurred several weeks after the slain person had been found. In fact, even identification from a distance may be sufficient. The example quoted in the Talmud there on folio 121, is that a Rabbi Yehudah ben Baba, performed a wedding ceremony for a woman five days after her husband had drowned and been identified. The Talmud justifies this due to decomposition of a corpse in water taking much longer that decomposition of features on dry land.

ומדדו AND THEY SHALL MEASURE — from the place where the corpse lies,

אל הערים אשר סביבת החלל UNTO THE CITIES WHICH ARE ROUND ABOUT HIM THAT IS SLAIN — in every direction, in order to ascertain which is the nearest.