In Chapter 4 of The Scarlet Letter, what two lines indicate the Doctor and Hester knew each other before their prison-house meeting?

Inof
The Scarlett Letter, after Hester's public punishment on the scaffold of
public shame, she is in such a state of wild distress once she is returned to her prison cell
that the jailer is compelled to call in a physician. The physician is the same man from the
crowd whom Hester had seen earlier who had riveted her eyes in a fixed gaze of
recognition:

appeared that individual, of singular aspect
whose presence in the crowdhad been of such deep interest to the wearer of the scarlet
letter.

Although, by a seemingly careless arrangement of his
heterogeneousgarb, he had endeavoured to conceal or abate the peculiarity, it wassufficiently
evident tothat one of this man's shouldersrose higher than the other. Again, at the first
instant of perceivingthat thin visage, and the slight deformity of the figure, she pressedher
infant to her bosom with so convulsive a force that the poor babeuttered another cry of
pain.

Though no direct statements are made, the stranger,
calling himself , fits the brief description given inof the intellectual scholar who was her
husband whose aspect floated before Hester's eyes along with that of the long absent visages of
her father and mother. With this in mind, Hester's remark to him upon his offer of a medicinal
for her baby identifies Chillingworth as someone known before, in fact, it identifies him as her
long missing husband.

Hester repelled the offered
medicine, at the same time gazing withstrongly marked apprehension into his face. "Wouldst
thou avenge thyselfon the innocent babe?" whispered she.

Along with the fact of his singular physical description marking him as one whom she
knew before, Hester's use of the word avenge confirms that he was in fact
her husband for it is only her husband who would have cause to avenge himself of her crime of
adultery. There is further confirmation of his previously known identity in the narrator's
remark that Chillingworth gazed at Hester with:

a gaze
that made her heart shrink and shudder, because so familiar, and yet so strange and
cold.