כֹּ֚ה אָמַ֣ר יְהוָ֔ה עַל־שְׁלֹשָׁה֙ פִּשְׁעֵי־צֹ֔ר וְעַל־אַרְבָּעָ֖ה לֹ֣א אֲשִׁיבֶ֑נּוּ עַֽל־הַסְגִּירָ֞ם גָּל֤וּת שְׁלֵמָה֙ לֶאֱד֔וֹם וְלֹ֥א זָכְר֖וּ בְּרִ֥ית אַחִֽים׃
Thus saith the LORD: For three transgressions of Tyre, yea, for four, I will not reverse it: because they delivered up a whole captivity to Edom, and remembered not the brotherly covenant.
Read kabbalistic (mystical) interpretation of Amos 1:9: and classical mystical sources.