Sforno on Leviticus 25:36/ספורנו על ויקרא כ״ה:ל״ו

1אל תקח מאתו, because this is the ethically good way to extend a loan to your financially embarrassed brother without charging him interest or something in lieu of interest.

2וחי אחיך עמך, you are required to do this if the Lord has endowed you so that you are financially able to extend such loans. The word עמך, alongside you, teaches what our sages termed “your own life takes precedence over that of your fellow.” (Baba Metzia 62)