וַיִּקְרָ֤א עַל־הַמִּזְבֵּ֙חַ֙ בִּדְבַ֣ר יְהוָ֔ה וַיֹּ֙אמֶר֙ מִזְבֵּ֣חַ מִזְבֵּ֔חַ כֹּ֖ה אָמַ֣ר יְהוָ֑ה הִנֵּֽה־בֵ֞ן נוֹלָ֤ד לְבֵית־דָּוִד֙ יֹאשִׁיָּ֣הוּ שְׁמ֔וֹ וְזָבַ֣ח עָלֶ֗יךָ אֶת־כֹּהֲנֵ֤י הַבָּמוֹת֙ הַמַּקְטִרִ֣ים עָלֶ֔יךָ וְעַצְמ֥וֹת אָדָ֖ם יִשְׂרְפ֥וּ עָלֶֽיךָ׃
And he cried against the altar by the word of the LORD, and said: ‘O altar, altar, thus saith the LORD: Behold, a son shall be born unto the house of David, Josiah by name; and upon thee shall he sacrifice the priests of the high places that offer upon thee, and men’s bones shall they burn upon thee.’
Read kabbalistic (mystical) interpretation of I Kings 13:2: and classical mystical sources.