Saying

Sayings were pithy statements expressing some truth, passed on orally.

Sayings associated with farting included "[they] who smelt it dealt it", "[they] who said the rhyme committed the crime" and "[they] who said the verse made the atmosphere worse." (TV: From Raxacoricofallapatorius with Love)

Determined to find out the secrets of the feline Sisters of Plenitude on New Earth, the Lady Cassandra quoted to her servant Chip what she believed to be an Old Earth saying: "Never trust a nun, never trust a nurse, and never trust a cat". (TV: New Earth)

As later quoted to Rassilon, there was, during the Last Great Time War, a saying about the Doctor of War: "The first thing you notice about the Doctor of War is, he's unarmed. For many, it's also the last." (TV: Hell Bent)

Behind the scenes

 * According to The Dalek Dictionary, "The one beside you is yourself" was a Dalek saying, signifying brotherhood among their species.