Parashas Acharei Mos · Passuk 18:05
Chabad.org — English translation + Rashi
Torah Temima points to Yoma 85b.
English: From where that saving a life overrides Shabbos? “That a person shall do them and live by them” — and not die by them.
Pikuach nefesh overrides Shabbos
The commandments are given for life; therefore life-saving suspends Shabbos restrictions.