The burial site of Sarah is described in the portion of Chayei Sara. The second verse of this portion contains some indications that, when examined with gematria, point to a cave.
(ב) וַתָּ֣מׇת שָׂרָ֗ה בְּקִרְיַ֥ת אַרְבַּ֛ע הִ֥וא חֶבְר֖וֹן בְּאֶ֣רֶץ כְּנָ֑עַן וַיָּבֹא֙ אַבְרָהָ֔ם לִסְפֹּ֥ד לְשָׂרָ֖ה וְלִבְכֹּתָֽהּ׃
(2) Sarah died in Kiriath-arba—now Hebron—in the land of Canaan; and Abraham proceeded to mourn for Sarah and to bewail her.
All these words point to the value 710:
- The standard value of קירת.
- The AtBash of ארבע
- The Revu'a of חברון
- The Achas Beta of ארץ כנען
It is worth noting that the word מערת "cave" appears in the same chapter, and its numerical value using standard gematria is 710.
(ט) וְיִתֶּן־לִ֗י אֶת־מְעָרַ֤ת הַמַּכְפֵּלָה֙ אֲשֶׁר־ל֔וֹ אֲשֶׁ֖ר בִּקְצֵ֣ה שָׂדֵ֑הוּ בְּכֶ֨סֶף מָלֵ֜א יִתְּנֶ֥נָּה לִּ֛י בְּתוֹכְכֶ֖ם לַאֲחֻזַּת־קָֽבֶר׃
(9) Let him sell me the cave of Machpelah that he owns, which is at the edge of his land. Let him sell it to me, at the full price, for a burial site in your midst.”