וְהָ֤יָה לָךְ֙ לְמֵשִׁ֣יב נֶ֔פֶשׁ וּלְכַלְכֵּ֖ל אֶת־שֵׂיבָתֵ֑ךְ כִּ֣י כַלָּתֵ֤ךְ אֲֽשֶׁר־אֲהֵבַ֙תֶךְ֙ יְלָדַ֔תּוּ אֲשֶׁר־הִיא֙ ט֣וֹבָה לָ֔ךְ מִשִּׁבְעָ֖ה בָּנִֽים׃
And he shall be unto thee a restorer of life, and a nourisher of thine old age; for thy daughter-in-law, who loveth thee, who is better to thee than seven sons, hath borne him.’
Read kabbalistic (mystical) interpretation of Ruth 4:15: and classical mystical sources.