Abu Da'ud أبو داود السجستاني الأزدي · The Book of Adornment

The Messenger of Allah said: "Ten things are part of the Fitrah: Trimming the mustache, trimming the nails, washing the joints, letting the beard grow, using the Siwak, rinsing the nose, plucking the armpit hairs, shaving the pubes, and washing with water (after relieving oneself)." Mus'ab bin Shaibah said: "I have forgotten the tenth, unless it was rinsing the mouth."

"Ten things are from the Sunnah: Using the Siwak, trimming the mustache, rinsing the mouth, rinsing the nose, letting the beard grow, trimming the nails, plucking the armpit hairs, circumcision, shaving the pubes and washing one's backside."

The Prophet said: "The best things with which you can change gray hair are Henna and Katam."

"The Messenger of Allah cursed the one who consumes Riba, the one who pays it, the one who witnesses it and the one who writes it down; the woman who does tattoos and the woman who has that done; and forbade wailing (in mourning), but he did not say that its doer is cursed."

"I heard Jabir bin Samurah being asked about the gray hairs of the Prophet . He said: 'If he put oil on his head they could not be seen, but if he did not put oil on his head, they could be seen.'"

"Umar said to Suhaib: 'Why do I see you wearing a ring of gold?' He said: 'One who was better than you saw it and did not criticize it.' He said: 'Who was that?' He said: 'The Messenger of Allah .'"

The Prophet saw a gold ring on a man's hand and he struck his finger with a stick that he had with him, until he threw it away.

"Jibril, peace be upon him, asked permission to enter upon the Prophet and he said: 'Come in.' He said: 'How can I come in when there is a curtain in your house on which there are images? You should either cut off their heads or make it into a rug to be stepped on, for we Angels do not enter a house in which there are images.'"