Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "All rights will be restored on the Day of Judgment, until even the hornless sheep will settle its score with the horned one."
Authentic hadith - Narrated by Muslim

The oppressed one will retaliate against his oppressor on the Day of Judgment; even the hornless sheep will settle its score with the one that has horns, {and your Lord is not unjust to anyone.} [Sūrat al-Kahf: 49]

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