It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) passed by a dead goat of Sayyidah Maymunah (may Allah be pleased with her) and said: "If only you had removed its skin, then tanned it and benefited from it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 47