Jeremiah
Jeremiah 17:21ESV·traditional attribution

Thus says the LORD: Take care for the sake of your lives, and do not bear a burden on the Sabbath day or bring it in by the gates of Jerusalem.

John Calvin Reformed @genevareformer

He bids them to attend, or to beware in their souls. Some render the words, “As your souls are precious to you.” But I take souls, not for their lives, but for the affections of their hearts; as though he had said, “Take heed carefully of yourselves, that this may be laid up in your inmost heart.” The word נפש nuphesh, means often the heart, the seat of the affections.

Matthew Henry Presbyterian @wholebiblehenry

These verses are a sermon concerning sabbath-sanctification. It is a word which the prophet received from the Lord, and was ordered to deliver in the most solemn and public manner to the people; for they were sent not only to reprove sin, and to press obedience, in general, but they must descend to particulars.

Commenting on Jeremiah 17:19-27

John Gill Reformed Baptist @doctorgill

Thus saith the Lord, take heed to yourselves,.... That ye sin not against the Lord, by breaking the sabbath, and so bring wrath and ruin upon yourselves: or "to your souls" (a); to the inward frame of them, that they be in disposition for the work of that day; and that they be wholly engaged therein, even all the powers and faculties of them; and...