ה֚וֹי הַשַּׁאֲנַנִּ֣ים בְּצִיּ֔וֹן וְהַבֹּטְחִ֖ים בְּהַ֣ר שֹׁמְר֑וֹן נְקֻבֵי֙ רֵאשִׁ֣ית הַגּוֹיִ֔ם וּבָ֥אוּ לָהֶ֖ם בֵּ֥ית יִשְׂרָאֵֽל׃
Rashi on Amos
those called the first of the nations—You were called the most praiseworthy of the nations.
Rashi on Amos
and the house of Israel has come to them—They chose the ordinances of the nations and came to be included among them.