In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Rabee Bin Khuthaym [rahimahullaah] used to say: There is no good in speech except in nine(affairs): Tahleel(i.e. uttering Laa-ilaaha ilal-laah); Takbeer (i.e. uttering Allaahu Akbar); Tasbeeh (i.e. uttering Subhaanallaah); Tahmeed (i.e. uttering Al-Hamdulil-laah); Enquiring about good; Seeking refuge from evil; Enjoining good; Forbidding evil and Recitation of the Qur’aan. [Ref 1]
Ibnul Akwaa came to Rabee Bin Khuthaym and said: Refer me to one who is better than you; he (Rabee) said: The one whose speech is a reminder for himself; his silence is (so that he can) think and his destination (in the Aakhirah is a reason) for reflection. He (i.e. this type of person) is better than me. [Ref 2]
[Ref 1: Source: ‘Kitaab As-Samt’ by Ibn Abee Dunyaa (rahimahullaah) page:246]; [Ref 2: Siyah A’laam An-Nubulaa: 4/261]