John Lightfoot on Luke 14:3

[Is it lawful to heal on the sabbath day?] A Jew will be ready to cavil against the truth of the evangelists upon the occasion of this and such like questions they report from our Saviour. What need had he (will such a one say) to ask this question, when he could not but know that, in danger of life, it was permitted them to do any thing towards the preservation of it. Nay, where there was no imminent danger, they were allowed to apply medicines, plasters, &c.; especially, which I must not omit, to apply leaven even in the time of Passover to a 'Gumretha,' some very burning distemper.

This is all true indeed; and this no doubt our Saviour understood well enough: but withal he could not but observe with how ill an eye they looked at him, and would not allow that in him which was lawful in another man. He was always accused for healing on the sabbath day, which whiles he did with a word speaking, he could not violate the sabbath so much as even their own canons permitted him: and wherefore then should they accuse him? In mere hatred to his person and actions. There are two little stories we meet with in places quoted before, which perhaps may serve in some measure to illustrate this matter.

"The grandchild of R. Joshua Ben Levi had some disease in his throat, There came one and mumbled to him in the name of Jesus the son of Pandira, and he was restored." Here we see the virtue and operation of Jesus not so utterly exploded, but they did allow of it.

"When R. Eliezer Ben Damah had been bitten with a serpent, and Jacobus Capharsamensis came in the name of Jesus the son of Pandira to heal him, R. Ismael forbade it." And so the sick man died.