Avraham' and his descendants were punished

     Nedarim (32a) R. Abbahu said in R. Eleazar's name: Why was our Father Abraham punished and his children doomed to Egyptian servitude for two hundred and ten years? Because he pressed scholars into his service, as it is written, He armed his dedicated servants born in his own house. Samuel said: Because he went too far in testing the attributes [i.e., the promises] of the Lord, as it is written, [And he sand, Lord God,] whereby shall I know that I shall inherit it? R. Johanan sand: Because he prevented men from entering beneath the wings of the Shechinah, as it is written, [And the king of Sodom said it to Abraham,] Give me the persons, and take the goods to thyself.