Sayyiduna Abu al-Darda' (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Purification is of four kinds: trimming the moustache short, removing the pubic hair, clipping the nails, and using the miswak."
Al-Bazzar and al-Tabarani recorded it. Its chain contains a narrator, Mu'awiyah bin Yahya al-Sadafi, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب اللباس / 8857