וַיִּגְוַ֨ע יִצְחָ֤ק וַיָּ֙מָת֙ וַיֵּאָ֣סֶף אֶל־עַמָּ֔יו זָקֵ֖ן וּשְׂבַ֣ע יָמִ֑ים וַיִּקְבְּר֣וּ אֹת֔וֹ עֵשָׂ֥ו וְיַעֲקֹ֖ב בָּנָֽיו׃ (פ)
And Isaac expired, and died, and was gathered unto his people, old and full of days; and Esau and Jacob his sons buried him.
Read kabbalistic (mystical) interpretation of Genesis 35:29: and classical mystical sources.