Adam Clarke on Jeremiah 37:12

Jeremiah went forth - At the time that Nebuchadnezzar had raised the siege, and gone to meet the Egyptian army.

Go into the land of Benjamin - To Anathoth, his native city.

To separate himself thence - "To receive a portion thereof among the people;" - Blayney: who supposes that Jeremiah went to receive a portion of the proceeds of his patrimony at Anathoth, which had, previously to the siege, been in the hands of the Chaldeans. The siege being now raised, he thought of looking thus after his own affairs. The Chaldee is to the same sense. "He went that he might divide the inheritance which he had there among the people." Dahler translates, 'He went to withdraw himself from the siege, as many others of the inhabitants." I believe he went to withdraw himself from a city devoted to destruction, and in which he could no longer do any good.