Narrated from Muhammad ibn Isma'il, from al-Fadl ibn Shadhan, from Safwan ibn Yahya, from Ibn Muskan, from Muhammad al-Halabi, who said: I asked Abu Abdillah عليه السلام, about a man who is in a state of ritual purity and then trims his nails or cuts his hair. Does he need to renew his ablution? Imam عليه السلام replied: "No, but he should wipe his head and nails with water." I then said: "They claim that it necessitates ablution." Imam عليه السلام responded: "If they argue with you, do not argue with them. Say, 'This is the Sunnah.'"