It is narrated from Sayyiduna Abdullah bin Mas’ud (may Allah be pleased with him), he says: I asked,“O Messenger of Allah! Which oppression is the greatest?”He (peace and blessings be upon him) said:“A piece of land, which a person seizes from his brother’s right; on the Day of Resurrection, a collar of that portion will be placed on that person down to the depths of the earth, and not even a pebble will be left out, and no one knows the depth of the earth except the One who created it.”