Sayyiduna Ibn Buraydah (may Allah be pleased with them both) narrates from his father that when Sayyiduna Ja'far bin Abi Talib (may Allah be pleased with him) returned from the land of Abyssinia, the Prophet (peace and blessings be upon him) met him and said: "Tell me of the most amazing thing you saw in the land of Abyssinia." He said: A woman passed by carrying a basket of food on her head. A man riding a horse passed by her and struck her, so her basket fell. I watched her as she gathered (the food) back into her basket, saying: Woe to you on the Day when the King places His Kursi and takes the right of the oppressed from the oppressor. The Prophet (peace and blessings be upon him) laughed until his molars became visible, then he (peace and blessings be upon him) said: "How can a nation be purified that does not take the right of its weak from its strong, without him being made to falter (in fear)?"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الغصب / 11514