Hadith 17:362
Usama narrated to us, from Mahdi, who said: We entered upon Muhammad ibn Sirin on a Friday after the afternoon (Asr) prayer. He called for [something], then he trimmed his nails and gathered them. Mahdi said: Hisham informed us that he (Ibn Sirin) used to order that they be buried.
حدثنا أسامة عن مهدي قال دخلنا على محمد بن سيرين يوم جمعة بعد العصر فدعا فقلم أظفاره فجمعها قال مهدي فأنبأنا هشام أنه كان يأمر بها أن تدفن