Rest, i.e. a quiet and happy life, free from those cares, vexations, encumbrances, and troubles which widows are in a special manner exposed unto. She kissed them, as the manner there was when friends parted.
Related Commentaries of Ruth 1:9
Ruth 1:9
9 The LORD grant you that ye may find rest, each of you in the house of her husband. Then she kissed them; and they lifted up their voice, and wept.