Matthew Poole and continuators on Jeremiah 37:21

21 Then Zedekiah the king commanded that they should commit Jeremiah into the court of the prison , and that they should give him daily a piece of bread out of the bakers street, until all the bread in the city were spent . Thus Jeremiah remained in the court of the prison .

So as he was a prisoner still, but in a freer air, where he did not suffer those inconveniencies which he indured in the hole or dungeon.

It is of no great moment to know whether the portion of bread allowed the Prophet by the King, were a loaf (as some think) or a piece of a loaf; it was such a proportion as could be allowed according to the proportion which others had, and the straits which the City was in, and so much as served to keep him alive.

Ieremiah remained here till upon the suggestion of the Princes, he was removed to a worse place, as we shall read in the sixth verse of the next Chapter; where he staid not long, but was again removed to the Court of the Prison, as we shall read there, verse 13 where (as it followeth there verse 28.) he continued until the City was taken.

Marginal references: chap. 32.2.