Matthew Poole and continuators on Jeremiah 17:22

22 Neither carry forth a burden out of your houses on the sabbath day, neither do ye any work, but hallow ye the sabbath day, as I commanded your fathers .

This command for the sanctification of the Sabbath, was given Exod. 20.8. repeated chap. 23.12. and 31.14, 15. Levit. 19.3. and 23.3. Deut. 5.12, 15. Ezek. 20.12. the bearing of burdens forbidden was such as was for profit, for in some cases it was lawful to carry burdens for the saving the lives of Men, or Beasts, and some learned men justifie the poor sick man carrying his bed when he was cured, not only from the command of Christ alone who could authorize him to it, though against the rule of the Law, but because he had no further occasion himself to be there, and was not obliged by the Law of the Sabbath to leave his bed behind him, himself going away, but no unnecessary burdens, no trading burdens might on the Sabbath day, be either carried out of the gates of the City, or out of the gates of any of their private houses.