“God blessed the seventh day and sanctified it, because on it He rested from all His labor that God created to make” (Genesis 2:3). “God blessed the seventh day and sanctified it” – it is written: “The blessing of the Lord, it will enrich, without adding toil with it” (Proverbs 10:22). “The blessing of the Lord, it will enrich” – this is Shabbat, as it is stated: “God blessed the seventh day.” “Without adding toil [etzev] with it” – this is mourning, just as it says: “The king is in grief [ne’etzav] over his son” (II Samuel 19:3).1Mourning the dead is not observed on Shabbat.