וַיַּצֵּ֧ב יַעֲקֹ֛ב מַצֵּבָ֖ה עַל־קְבֻרָתָ֑הּ הִ֛וא מַצֶּ֥בֶת קְבֻֽרַת־רָחֵ֖ל עַד־הַיּֽוֹם׃
And Jacob set up a pillar upon her grave; the same is the pillar of Rachel’s grave unto this day.
Read kabbalistic (mystical) interpretation of Genesis 35:20: and classical mystical sources.