Sayyiduna Jabir (may Allah be pleased with him) said that al-Tufayl bin Amr al-Dawsi (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him) and said: "Would you like a strong fortress and protection?" (Daws had a fortress in the time of ignorance.) He (peace and blessings be upon him) declined, because of what Allah had reserved for the Ansar. When he (peace and blessings be upon him) migrated to Madinah, al-Tufayl (may Allah be pleased with him) and another man of his people migrated with him. On reaching Madinah they found its climate unwholesome; that other man fell ill, and from the intensity of his suffering he cut his finger joints with arrowheads, so that his hands bled profusely and he died. Al-Tufayl (may Allah be pleased with him) saw him in a dream in a good state, and saw that he had covered his hand. Al-Tufayl (may Allah be pleased with him) asked him: "Why have you covered your hand?" The man said: "I was told: We will not mend what you yourself have ruined." Al-Tufayl (may Allah be pleased with him) related the whole dream to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: 'Allahumma wa li-yadayhi faghfir' (O Allah, forgive his hands as well).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15835